And how long does implantation bleeding usually last?
Just to be technically correct, HcG is produced as soon as conception happens, rising rapidly, but it cannot be detected at that point. Only after implantation can it be detected in blood or urine. So, HcG will be present even before implantation, just cannot detect it. After implantation, one needs to wait at least 2-3 days for HcG to be shown in any reasonable amount (15mIU for blood test) to show positive. For early HPT (urine test), HcG needs to reach 25mIU which can usually be reached within 5 days after implantation.
With respect to implantation bleeding, you may not get it at all, and even if you do, it doesn't always mean implantation happened that day. One can even get brown spotting from previous implantation bleeding after six weeks of being pregnant as well.
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