Ninah, not sure how long it takes Pregnyl to leave the system, but my understanding is that the levels of HcG are not detected until implantation occurs. Again, only from my understanding (and I could be wrong) I think the earliest implantation can occur is 5dpo.
This is always the tricky bit, though, because if you have, say, a transfer at day 5, technically that is already 5dpo which one would think means you could POAS almost straightaway.
I'm hoping to day a day 5 transfer, this Wednesday. Yet my clinic is making me wait 2 weeks after this Wednesday, so BT on 16/12/09
Perhaps try POAS one week after transfer? I've sworn off POASing until I get a positive BT as they just destroy me when I only see one line.
I've heard that it takes 5 days......but my clinic didn't do a BT until 7 days after my last Pregnyl shot. I was too chicken to do a HPT LOL so good luck!
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