So my boyfriend & I had sex while on my period. Not heavy at all. No condom. & The next day it was gone. It's been 29 days now & I haven't had it since. Side notes: I take birth control pills for my menstral only, not for sex. I have a menstral cycle disorder. & I don't take them everyday. I miss a lot & take three all at once sometimes. Or just miss a pack. Yes that's bad. But ALL I would like to know is if I may be pregnant?

It's absolutely possible you are pregnant since you had unprotected sex. Since you don't take the pill as directed, whether it be for periods or protection, you might as not take the pill at all.