A member asked:

Sex then plan b right after. and a negative pregnancy test 9 days later i believe,she got cramps the day after sex and has had them for 13 days now... could it be pregnancy?

3 doctors weighed in across 3 answers

Suggest repeat pregnancy test via serum HCG, as "9 days after sex" is too soon for a home test to be positive.

Answered 3/25/2022

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Dr. Theodore Davantzis answered

Specializes in Dentistry

HPTs are accurate about a week after a missed period. Nine days may have been too soon. Has she missed her period? If so, test again.

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 3/28/2022

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