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Doctor insights on: False Negative Pregnancy Test Breastfeeding

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What are the odds of false negative pregnancy test while breastfeeding?

What are the odds of false negative pregnancy test while breastfeeding?

Pregnancy Tests: Pregnancy tests are designed to look for the presence of beta-hcg which is a hormone produced by a conceptus and acts to maintain a pregnancy. The level rises very quickly after conception and can be detected as early as 1 week after conception and almost always by 2 weeks after conception. False negatives occur during this 2 week period. Breastfeeding does not impact this hormone. ...Read more

Dr. Marvin Ott
4 doctors shared insights

Pregnancy (Definition)

When your due date arrives, you will be more than ready to have your baby! Most women deliver the baby somewhere between 37 and 42 weeks. According to the American College of Obstetricians and Gynecologists, only 5% of babies arrive on the exact due date. Approximately 7% of babies are not delivered by 42 weeks, and when that happens, it is referred to ...Read more


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2 months postpartum. Not breastfeeding. Why haven't i had my period yet? 3 negative pregnancy test! and could i still be pregnant?

2 months postpartum. Not breastfeeding. Why haven't i had my period yet? 3 negative pregnancy test! and could i still be pregnant?

Time to adjust: It takes time to reset your periods after having a baby. If you had very irregular or widely spaced periods before your baby came, you may be going back to that model. If your periods were quite regular, remember that you could be ovulating, and get pregnant as a result of unprotected sex during ovulation. So do be careful, but remember that a new baby is a lot for your body to adjust to! ...Read more

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I had a negative pregnancy test and I am breastfeeding, but I am 1week4days late after 42 days,I have heavy bleeding bright red blood. Is this normal?

I had a negative pregnancy test and I am breastfeeding, but I am 1week4days late after 42 days,I have heavy bleeding bright red blood. Is this normal?

Not unusual: If your period was late, there may have been additional build up of uterine lining in that time, leading to particularly heavy period this time. You are not pregnant, so not to worry. Make sure you are getting adequate iron in your diet to have enough for your blood loss and feeding your baby. May need a temporary iron supplement. ...Read more

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Possibility of false negative pregnancy test 36 days after intercourse? Also on birth control and used condom but am having spotting and heavy cramps.

Possibility of false negative pregnancy test 36 days after intercourse? Also on birth control and used condom but am having spotting and heavy cramps.

No: So all you need is to be off on bcp, have condom fail, be in ovulation window, and have a swimmer find egg? If still worried, can always re-test, but should not be due to pregnancy. ...Read more

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Breastfeeding my 12 month old with no period. Lower abdominal and back cramps, night nausea, painful sex with negative pregnancy test. Any help?

Breastfeeding my 12 month old with no period. Lower abdominal and back cramps, night nausea, painful sex with negative pregnancy test. Any help?

Low estrogen state: As long as you are breastfeeding your body will remain in a low estrogen state with minimal pituitary activity. That accounts for the thinning of the vaginal walls and painful intercourse that can be addressed with local estrogen cream or breastfeeding cessation. I also hope contraception is being used as an egg can still "pop out" with attendant pregnancy. See your GYN MD for further advice & Rx. ...Read more

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How often could a false negative pregnancy test occur?

How often could a false negative pregnancy test occur?

Not often: Pregnancy tests are quite accurate. A pregnancy test should be accurate by about 12 days after your ovulation, so by the time your period is late the test should be accurate. ...Read more

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What is the probability of a false negative pregnancy test?

See below: When done in accordance with manufacturer's direction, both sensitivity and specificity are high. ...Read more

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What are the chances of getting a false negative pregnancy test?

Rare: If you do a pregnancy test accurately and at the right time, the chance of a false negative test is less than 1%. It is important to do it when you have missed your period. Doing it too early, is the most common reason for a false negative pregnancy test. ...Read more

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Ovarian cysts and a false negative pregnancy test?

Ovarian cysts and a false negative pregnancy test?

Please clarify: The question is not clear. Ovarian cysts are common and do not interfere with pregnancy tests. ...Read more

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What's the probability of having a false negative pregnancy test when my period is 3 days late?

What's the probability of having a false negative pregnancy test when my period is 3 days late?

Not inconceivable: Sorry but pun was intended. While home pregnancy tests are fairly sensitive, some women will have a negative test early on during pregnancy. So if you've been engaging in unprotected sex and your test is negative 3d after being late, then repeat test once you're a week or two late. By 2 wks late or 6wks after last menstrual period, home pregnancy test should be positive if you're pregnant. ...Read more

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Can I get a false negative pregnancy test and still be pregnant if I tested 3-4 days before my period ?

Can I get a false negative pregnancy test and still be pregnant if I tested 3-4 days before my period ?

Yes: A urine pregnancy test, done correctly, gives a reliable result 3 weeks after sex (3 weeks after when conception might have occurred), or 1 week after missing a period. If done sooner, a positive result is likely real, but a negative result may be due to testing too soon, and thus lead to a repeat test. ...Read more

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Can irregular cycles have an impact on the amount of hCG released and therefore cause a false negative pregnancy test?

No: Irregular cycles do not impact HCG levels but do result in inaccurate estimation of length of pregnancy and so if pregnancy test done too early after conception, maybe negative. ...Read more

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I was reading a study on genistein and its effects on hCG production. Is it possible it can cause a 'false negative' pregnancy test result?

Usually not: If you have a good quality urine HCG test, it should not give a false negative reading . If you have any questions, see a provider to be sure. ...Read more

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Can Topomax cause false negative pregnancy test?

Can Topomax cause  false negative pregnancy test?

No: If the test is a conventional pregnancy test, it should not make any differance. However, for the accuracy serum hCG test always available in an OBGYN's office.
Good luck. ...Read more

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Took 5 htp could it be a false negative pregnancy test?

Took 5 htp could it be a false negative pregnancy test?

5-Hydroxytryptophan: Should not effect your pregnancy test result. ...Read more

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Is there a possibility to get a false negative pregnancy test when drinking water all day?

Is there a possibility to get a false negative pregnancy test when drinking water all day?

Yes: If the urine is too dilute the test may not recognise the minute amount of hormone (HCG) in the urine. That is why we prefer a first voided urine in the morning. ...Read more

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Can decidual bleeding during early pregnancy give you a false negative pregnancy test after having tested positive?

Can decidual bleeding during early pregnancy give you a false negative pregnancy test after having tested positive?

See below: If you have a positive pregnancy test this is due to a pregnancy - but you need to have this confirmed for a viable pregnancy too. ...Read more

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Can exercise cause a false negative pregnancy test?

Can exercise cause a false negative pregnancy test?

No: Exercise is not likely to affect the pregnancy test result. ...Read more

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What are the chances of a false negative pregnancy test I've been having a lot of symptoms took a test and it said negative ?

What are the chances of a false negative pregnancy test I've been having a lot of symptoms took a test and it said negative ?

Possible if early: A false negative pregnancy test is possible if the test was done too early or the test is beyond its expiration date. Wait for 3-5 days and do a repeat test using your first morning urine. If it is still negative, there is another cause for your symptoms. Hope this helps. ...Read more

Dr. Dariush Saghafi
4 doctors shared insights

Breastfeeding (Definition)

Breastfeeding is providing nutrition to an infant using breat milk either directly by infant latching and sucking on the nipple or by feeding via bottle with expressed breast milk (when baby has difficulty suckling). Breast milk is the best milk for any baby but ...Read more


Dr. Stephen Sudler
482 doctors shared insights

Pregnancy Test (Definition)

A pregnancy test measures a hormone called human chorionic gonadotropin (HCG). HCG is a hormone produced during pregnancy. It appears in the blood and urine of pregnant women as early as ...Read more