Big question, help me please

Hii, soo apparently I've started my period but I'm like 10 days before normal, last week (on Monday) me and my SO had unprotected sex (I know it's irresponsible, not happening again) and I took the postday pill in the next hour of our unprotected relation and now I'm "bleeding" but for now is less than a normal period flood is, I'm worried it's the bleeding bc the egg implanted on my uterus. 
Help me please?
Oh and I'm supposed to ovulate today but idk what if I did it earlier