My period has been kind of irregular as of late, and this month I seemed to have missed it completely. It usually comes in-between day 28 and day 30, but it's been almost a week and a half and still nothing.

My boyfriend and I had unprotected sex on day 27 of my cycle (he pulled out.) I started bleeding bright red during it (I found out later that I have a yeast infection and that was the probable cause of that)

Anyway, I haven't started my period, my breasts were a bit tender yesterday and the day before (not so much today)

I've had two negative pregnancy tests, and I'm 98 lbs so I was thinking that and the yeast infection may be why I skipped my period?

I don't know. I'm really freaking out. How likely is it that I got pregnant?