This happened with my last IUI and it was a chemical pregnancy that only showed on a beta. I never really had a full on period, and come think of it, I haven't since. Last cycle was natural, and I may have had one day of red blood. I've never seen a positive when I POAS. Did anyone else have their cycles completely screwed up due to all the meds? I'm wondering if I should call my RE about it.
Re: 21 dpiui, spotting, no AF
I've not been in this situation before...but if it were me, I would call the RE.
Good luck!