A member asked:

I have a friend who has taken plan b, has had 1 positive pregnancy test 7 days after sex then a negative test 2 days after. then a negative test 2 weeks later and 5 days after that another negative, shes had cramps for 13 days now, is it pregnancy?

2 doctors weighed in across 2 answers
Dr. Theodore Davantzis answered

Specializes in Dentistry

HPT's are accurate about a week after a missed period. The positive test seven days post encounter was most likely a false positive. Has your friend missed her period? If so, have her see her OBGYN since the dates you posted add up to 28 days after intercourse.

Answered 3/25/2022

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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.

Answered 3/25/2022

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