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A 32-year-old female asked:

16/02 unprotected sex (during fertile window) 17/02 took plan b.. 01/03 light bleeding.. can it be menses or withdrawal bleeding? i also had tender breasts since last week but today they are no longer sore? also had a negative urine test?

2 doctor answers2 doctors weighed in
Dr. Yvette Kratzberg
Pediatrics 26 years experience
Plan B, sometimes referred to as the “morning after pill,” is emergency contraception you take within 72 hours after unprotected sex. It contains a high level of hormones that interfere with ovulation/implantation of fertilized embryo. It should not be used regularly as the levonorgestrel can have side effects including nausea, abdominal pain, fatigue, headache, irregular bleeding, breast pain.
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Dr. Gurmukh Singh
Pathology 51 years experience
Conception occurs within day or so of the sex. It takes about 3 weeks for the embryo to make enough HCG for a positive pregnancy test. Blood test may be done a day after a missed period. Home pregnancy tests should be done 4-5 days after the missed period. If the result is negative repeat the test in 4-5 days. Use first morning urine and follow instructions for the test carefully.
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Related questions

A 21-year-old female asked:
I ve unprotected sex on 27 last month but taken morning after pill within 24 hrs and my periods should come on 4-5 of this month bt are late with cramps mood swings and sore breasts. i dont had pms earlier and my periods are quite normal. what now??
Dr. Hiep Le
Dr. Hiep Leanswered
Nephrology and Dialysis 44 years experience
The morning after pill can give you those symptoms and late period. If you do not have period in 3 days, i.e. missing period for more than a week, you... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 32-year-old female asked:
Last cycle 12/01. Unprotected sex 12/17. On mini pill + took plan B. Nausea and sore breast but negative test. Its been 21 days since sex and 38 since last cycle. Are my negative test legit? And Im freaking myself out?
Dr. James Ferguson
Pediatrics 48 years experience
Normal women can occasionally skip a cycle. Plan B taken within a day or 2 after sex is usually quite effective in preventing pregnancy. Common urine ... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 19-year-old female asked:
Had unprotected sex with partner,took morning after pill 30 hours after due to worry even though he did withdrawal method. Period is 5 days late, should I worry? Breasts are so sore, is that PMS?
Dr. Boniface Ikejiani
Obstetrics and Gynecology 29 years experience
Delayed menses: A 19 yo female who had unprotected intercourse and took morning after pill 30 hours after intercourse now present with delayed menses and breasts ten... Read More
Created for people with ongoing healthcare needs but benefits everyone.
A 20-year-old female asked:
Period 3 days late but having mild cramps and no sore breast. had unprotected sex on first fertile day but no ejeculation inside. whats happening?
Dr. Parul Krishnamurthy
Obstetrics & Gynecology 36 years experience
Do a pregnancy test: If negative, and still no period, then repeat another one in 5 days or so.
Created for people with ongoing healthcare needs but benefits everyone.
A 21-year-old female asked:
25 days after sex& plan B, still no period. 3hpt all neg. went to dr. for urine test it was neg but i still have sore breasts, gas, and cramps? scared
Dr. Pierrette Mimi Poinsett
Pediatrics 40 years experience
Likely not pregnant: Plan B can disrupt 1-2 menstrual cycles resulting in later than expected periods. It is likely that you are not pregnant given the negative test in ... Read More
Created for people with ongoing healthcare needs but benefits everyone.
Last updated Mar 12, 2022

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