last month was my first month and femara. I had the same spotting, and my cycle was also 30 days. (usually mine is 35 though, so 30 was better for me). . . the spotting bothered me too, I kept hoping that it was implantation bleeding. But no, finally af came full force. This is my second month on it. I o'd the same day this day as last month, so expect the cycle will be 30 days again. Good luck with your IUI!!
Thanks for the comments. Yeah, I kept thinking maybe it was implantation bleeding too, even did 2 HPTs which were negative :-(
At least it may help me predict ovulation/cycle length better. I ovulated about the same time without Femara but my luteal was between 11-13 days. Now I know it could be exactly 15 days (I O'ed on cd 15).
Sounds like you are in the TWW? I'll keep my fingers crossed.