I'm curious too as to what N2L asked about when she is getting the positive HPT?

The progesterone dose differs between people and also clinic protocol, Our first few cycles I had 1 pessarie a day, the next couple I had 2 a day. On frozen transfers- none. So I guess it depends on different things.

My understanding is that extra pessaries MAY stop her period but not neccesarily going to sustain a non viable pregnancy. Unfortunatly so many 'things' come into play with IVF and sometimes the simpilist answer might seem the easiest but it can be so much more complex then that there are a million different reasons why a pregnancy isnt viable.