Pill Popper

So like we figured my second beta came back negative last night. I start another round of Provera today.. and the cycle continues.  I am though, very confused. I dont understand how I had the trigger shot and am obviously not pregnant but have not started AF. I think im going to email our RE today and see if I can get some answers. I am also going to ask if next time there is any way to tell if I have O'd.