Just a quick post to say progesterone pessaries, crinone, pregnyl, etc will not necessarily stop bleeding. Many women on this forum have experienced bleeding while on luteal support, myself included several times.
Agreed. The pregnyl has always delayed AF for me, but the progesterone certainly doesn't. I had AF show up early after our first IVF (just 2x crinone daily for luteal support). Even after last year's natural FET, AF showed up a day early (for no apparent reason!) in spite of me using 2x 200mg progesterone pessaries daily.

Kel, if you think you could possibly get the positive tonight, then there's no harm in testing again. I usually start testing at least twice per day once the line starts to darken, and 3 times per day if the tests are getting close to positive.