Casper, WY
A 24-year-old female asked:
Is a pregnancy test taken with first morning urine accurate after 40 days since sex . i had my period, on time was just lighter?
2 doctor answers • 3 doctors weighed in

Dr. Heidi Fowleranswered
Psychiatry 27 years experience
HCG: A home pregnancy test should be accurate at 40 s/P sexual activity.
Created for people with ongoing healthcare needs but benefits everyone.
18 viewsReviewed >2 years ago

Dr. Gurmukh Singhanswered
Pathology 51 years experience
Timing of testng: 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.
Created for people with ongoing healthcare needs but benefits everyone.
18 viewsReviewed >2 years ago
Last updated May 14, 2021
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