Could I get pregnant?

I’ve started having unprotected sex around the 23rd (im a virgin so it took a could of days to get it in so there was just rubbing against so maybe get got it in on the 25th?) of this month but he never came, during any of those and we’ve done this everyday since.

He came in me a bit today, but today I’m supposed to get my period today also, I’ve felt the little period pains yesterday but nothing yet. I definitely haven’t been eating right or drinking water like I normally do, this is something I do everyday so I think it might have messed up my cycle too but I also have irregular periods.

What are the chance I could get pregnant?