If it's already positive (per HPT), and most pregnancies are positive by this point, then you should not need to worry about the interpretation of a potential negative. Yes, it will be much lower than a test 4 days later and should be interpreted as such. Any reading must be interpreted based on when it was made.
However, if it is negative, then you cannot rule out pregnancy. In rare cases, the embryo may implant a little later than 8dp5dt. Your positive HPT suggests this is not the case.
However, if it turns out to be negative, you have the option of following up with further HPTs (for at least a further week or more, check with your RE). Your clinic should want to perform some of them. Based on them, you might elect to have another blood test later.
Some clinics don't even run blood tests, and rely on HPTs only.
leorira11 wrote:Ghost --
Long story short, but I have another round of blood tests to do, in addition to my beta (CBC, cholesterol, etc from my GP). I was going to do all the blood draws at once, because getting blood is a pain for me (teeny veins, bruise like a peach).
My referral for the blood tests expires tomorrow -- I'll only be 8dp5dt. Would that be late enough that if the beta is negative, the cycle didn't work? I understand that if it's positive, the levels will be much lower than I'm used to hearing, since it'll be 3-4 days before my clinic usually does a beta.
I'm getting super faint positives on home pregnancy tests (urine). I'm super tempted to do the beta with my other blood tests tomorrow!
Bottom line -- how early is the earliest you can determine that a cycle is negative?
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