Could I be pregnant?

So I had unprotected sex on October 30 and I got my period the next day. But now I've had to delay my period three times on Glow and I'm kinda freaking out that I may be pregnant, even though I know my periods are notoriously irregular. He didn't finish inside me (he didn't finish at all, period) but I know it's possible to get pregnant from pre-cum and that guys can't feel when they pre-cum. Is there a chance I could be pregnant? I mean I kinda doubt it since I got my period the next day.