A member asked:

My period is due in 8 days. i did a clear blue ovulation tracker that showed i was not ovulating. if i took a plan b would it work to prevent implantation? cycle is regular 28 days?

3 doctors weighed in across 2 answers

EC is only expected to work if it is taken within the time frame listed, for most 72 hours from exposure.

Answered 5/9/2021

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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 5/10/2021

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