How long after fertilization can an early pregnancy test detect pregnancy?
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If I have sex on a Thursday and conception/ovulation happens the same day, can a home pregnancy test detect the pregnancy hormone (hcg) the following Thursday (7 days later)? If so, what is the likelihood of the test detecting hcg that early?
It depends on how early the fertilized egg begins the implantation process once it reaches the uterus, because that’s when HCG levels begin to increase. Implantation, on average, begins somewhere 7-10 days after fertilization although it happens slightly earlier or later in some cases. I’d say that 7 days after actual fertilization is on the outside of what might be detectable by a home pregnancy test and chances are very, very slim that early. As in you’d be better off waiting until at least 10 days after ovulation to even think about testing and you’re still very likely to get a possibly false negative. Even a blood test, which is very sensitive, generally won’t detect a pregnancy until at least 10 days after ovulation and fertilization.
I believe its at least two weeks. I found out I was pregnant exactly 2 weeks after conception, 1 day after my missed period.
Most HPTs say the earliest they can detect hcg is around 10 dpo. 7dpo is probably too early, though I’m sure you can find someone on here who knew that soon.