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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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Took Plan-B After Unprotected Sex. Different Tests Respond Differently To Pregnancy. Best Solution?

Can a miscarriage cause a positive result on a pregnancy test? My roommate had her period on March 9, and had unprotected sex after it was over. 12 hours after she had unprotected sex she took the plan B pill . Then that sunday March 18 she started her period again. Then she had unprotected sex again on april 7, and took another plan B on the 8th. When she didn t start her period on the 9th or the 18th of April she took a home pregnancy test on the 16th of April and it came back negative. Then she took another one this past Monday and it came back positive. We went to a clinic here in town and they did a pregnancy test and it came back positive as well. Then she went to another clinic down in one of the closer big cities and they did one and it came back positive as well. They did an ultra sound and they said that they couldn t see anything. The first clinic that we went to told her they estimated that she was about 5 weeks pregnant . The second clinic that she went to told her that she could be having an atopical pregnancy or it could be too early to see anything on the ultra sound. My questions to you are, can a miscarriage cause her to be getting false positives, can the plan B cause her to get a false positive, or is it really just too early to tell?
posted on Sat, 28 Apr 2012
Twitter Thu, 26 Jul 2012 Answered on
Twitter Fri, 27 Jul 2012 Last reviewed on
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OBGYN,  's  Response
hi,
plan B which is the emergency contraceptive pill that can usually protect from pregnancy as she has taken within 24 hours of intercourse,
they are having side effects like menstrual irregularities, they can prepone and postpone the periods depending on the time when they have taken,
so as she took tablet in first half of the cycle first time they might have preponed her periods, then as she took in the second half, there is a chance for postponing the period,
anyhow as there is 1% failure rate for pill the chance of pregnancy is also there,
so you better go for blood test for pregnancy and then repeat ultrasound which will rule out the possibility.
take care.
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Took Plan-B After Unprotected Sex. Different Tests Respond Differently To Pregnancy. Best Solution?

hi, plan B which is the emergency contraceptive pill that can usually protect from pregnancy as she has taken within 24 hours of intercourse, they are having side effects like menstrual irregularities, they can prepone and postpone the periods depending on the time when they have taken, so as she took tablet in first half of the cycle first time they might have preponed her periods, then as she took in the second half, there is a chance for postponing the period, anyhow as there is 1% failure rate for pill the chance of pregnancy is also there, so you better go for blood test for pregnancy and then repeat ultrasound which will rule out the possibility. take care.