For me it took 7 transfers and 13 embies. My girls are number 12 and 13, but I only discovered right before my 6th transfer I have one of the thrombophilia blood clotting disorders and after being treated with clexane, low dose aspirin and predinisine I got my BFP.

Since then I have had 2 transfers, one pregnancy but blighted ovum, one bfn and one natural pregnancy. My odds seem to have improved with my diagnosis.

So my point is I think it depends on your issues. If it Is mfi I think you tend to get your BFP earlier. If it is unexplained the same unless it is something they haven't yet diagnosed. If you know what the issue is and can treat it you might get your BFP sooner. It is just all so individual and sometimes all so random. GL to everyone trying xx