I don't think I would be pregnant... But..

I'm really scared.

I always have off periods, but lately I've been keeping track and sort of have a grip on it. I've used an app that gets pretty darn accurate. Maybe a day off or two. My periods are usually about 40 days but the last two have been 24-28 days)*

I had sex with my boyfriend last night. I thought I just started my period because earlier that day I saw blood and it's about that time. (and a week earlier, I had been spotting blood the same day i calculated a good time frame for my ovulation) so my boyfriend midway through took off the condom. Once I noticed and scolded, he put a new one on but kept going. It was only about a minute that it was off. He never ejaculated, even after with the condom on. But I know, precum... (if it's any help, he had the condom on before foreplay and we hadn't done anything in a month) We Always practice safe sex by time planning and using a condom, (waiting on dr for birth control) i guess he just assumed since I was on my period it'd be okay..*

I thought I'd be okay because I saw blood earlier that day. (bright red. few drops to make me believe I was catching myself start. Caught it before going out last night) *But the blood never came back afterwards. And tonight I got the stringy cervical mucus you see near ovulation.however it's very lightly tinted pink when I wipe. *Even if my cycle had gone back to the 40 days, I STILL would have passed my correct ovulation. But I"m still horrified because of the discharge, and because I am on antibiotics for a step throat.

Bad chance I'll get pregnant?

Very difficult to say. You can test in about two weeks if you don't get your period before then. Even if you were ovulating, though, it's not certain you would be pregnant so you just don't know.