Help!!

I had sex twice 11 days before my period with no condom but he didn’t cum in me. And then the exact day this app said I was gonna get my period, I did. And the first day it was a heavy flow and I had bad cramps and then the second and third day it was less. I’m on the third day now and it’s like barely there. I have very light bleeding. It’s not normal for me to have a three day period. But I can’t be pregnant though if I got my period on the day I was supposed to though right??! And I had sex 11 days before day 1 of my period. So i can’t be pregnant right? Please help!!