When testing and you get a bfn. Just read this
There are soooo many factors that can affect *when* you test positive, even if you know the exact moment of ovulation and/or fertilization. Even throwing out different things we can do that will affect (like being overly hydrated which dilutes our urine): 1. The egg is viable for 24 hrs after it is released, so there's day one (If you're counting from when you had sex, you could have another few days in there!). 2. Let's say a sperm finally found it 'round the end of that day, and then the now-fertlized egg keeps up it's lazy tumble toward the uterus... that can take anywhere from as little as three days to as many as FIFTEEN...in the rarest of instances, possibly up to eighteen It's crazy, I know. The average is about 7 - 9 days. 3. After that, it can take up to 4 days to fully implant, but your body usually recognizes that something's going on and starts it's skimpy production of hcg within a day or two. So there's two more days before it even turns on the hcg factory. 4. It takes another day or two for it to be detectable at all in your blood, and your urine hcg levels will always lag behind your blood levels. 5. Once it is measurable in the blood (we're talking a 5+), figure on 2 days for it to reach that in your urine. If it doubles every 2 - 3 days, then that would take a few more days to be detectable on the "early result" tests. Summary: even at the average *minimums* in those 5 major steps, that still puts you at 12 dpo before you would likely test positive. Clinically, the first response/answer early detection tests consistently have the best early detection rates. But that's only if there's enough there to be detected (and assuming no variation in production quality of tests, which there most definitely ARE in every brand). All things considered, it's perfectly feasible to not test positive until 21 days after ovulation. But as a benchmark to give yourself a "likelihood factor", the average woman will test positive with an early detection test around 24-36 hours before a missed period. The "majority" (as opposed to average) will test positive with an early detection test anywhere from 48 hours before missed period until 24 hours after missed period.
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