can a blood test detect pregnancy before a missed period

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How long after a missed period will a blood test be positive? Can ovulation occur while pregnant? When u miss ur period due to preg how many wks r u?

Female facts

Ovulation
Once you are pregnant you don't ovulate again. The average home pregnancy test will show + for pregnancy after the period is missed. Early pregnancy tests may detect pregnancy up to 6 weeks prior to anticipated period. Ovulation is usually about 14 days prior to anticipated period .
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How long before a missed period will a blood test detect pregnancy?

Pregnancy

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Great majority of pregnancies occur when coitus takes places within the 3 day interval just prior to ovulation. The first hormonal evidence of implantation (appearance of HCG) ocurred on 8 to 10 days after ovulation. Some commercial urine pregnancy test dont become positive until 5 days before your missed period. If negative and still suspect a pregnancy do a blood level pregnancy test.
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Dr. Robert Kwok answered:

Can you get a positive blood test for pregnancy 8 days before your missed period??

Sometimes, but...

Blood
That is very early, so often the test will still be negative, and one will end up retesting. Patience is a vital virtue for any aspiring parent-to-be. One should just wait 3 weeks after the estimated date of fertilization, and test then.
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I have a missed period not normal 17 day late ultrasound can see sac or fibroid. Blood test on day 10 neg. chance preg Remedy for pregnancy

Tests are accurate

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If you have taken pregnancy tests at home and they are negative then you can rest assured that you are not pregnant. You will need to see your doctor to discuss irregular periods. I would also discuss birth control options to avoid an unplanned pregnancy and avoid these scares in the future.
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I have missed my periods and no pregnancy blood test negative for my beta hcg. What othet test i can do to rule out my missed period reason.

Multiple

You need to see your gynecologist. You can be evaluated for abnormalities of pituitary function, since that gland regulates the ovaries through hormones; also for primary ovarian function. You may need a biopsy of the uterine lining to see how it responds to hormonal stimulation. There may be other tests.
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Dr. Hector Chapa answered:

4th day of missed period (30 day cycle). getting pregnancy symptoms but negative HPT (strip). Also have UTI. how soon can i take a blood test.?

Try another test

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Most HPTs are pretty sensitive and should be positive by a missed period. A negative HPT, assuming it was done correctly, is pretty accurate. If you are concerned it was false, you can do another one 48 hours later. This will save you a blood test. Two negative tests make it pretty clear it's negative. Symptoms may actually be the start of a cycle as well. The UTI shouldn't interfere with this.
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If my blood test taken 12days af yer the missed period for BHCG came as 0.4 & home pregnancy test also negative. Can I be sure I am not pregnant.

Home pregnancy tests are very accurate.

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They are the same tests used in a doctors office. They can detect a pregnancy 7-10 days after conception. The best time to take one is when you miss your period.  If you doubt the result you can repeat it in 1-2 days. If you were pregnant the hormone level would rise enough for detection
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After 4 days of missed period,blood test for pregnancy is done.but it was negative.no period untill now.we are trying to conceive.can still b pregnant?

Clarification

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What does 'no period until now' mean. If it means that your period was late but that you now have it - you are not pregnant. Late period reasons: low body wt, obesity, weight ^ or v, ^exercise, endurance athletics, breast-feeding, stress, illness, eating disorders, anovulatory cycle (no egg released), travel, perimenopause, just starting menstruation, hormone irregularities,drug use, meds etc.
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Dr. Gurmukh Singh answered:

(first day of last period august 28th)negative blood test for pregnancy (sept. 21st)and a missed period 5 days (sept.25)later can I still be pregnant ?

May be

The blood test was probably done too soon to be meaningful. You may do a home pregnancy test now or see your doctor for a repeat blood test and ultrasound examination.
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Dr. Ajay Acharya answered:

How accurate is a pregnancy blood test on first day of missed period?

99.9%

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Pretty good.
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