Hmm, I don't know how much help I am going to be but your spotting can be from a few things. Here are the top four I can think of
1) IB

2) You ovulated and it's a bit of spotting from the egg popping out
3) You are getting ready to ovulate and it is caused from a drop in estrogen levels
4) AF
So hopefully it is IB. I would talk with your doc about the progesterone cream. I am a little concerned that you are taking progesterone because if you were taking it before you ovulated that could be the reason why you weren't ovulating. Progesterone cream should only be taken after your sure you ovulated. Sorry, I know I wasn't much help.
I'll be crossing my fingers for you!