Scared but Happy

Lily

So I had my period last month on the 13th. My periods are 5 days long. 4 days after my next expected ovulation date my boyfriend and I had sex. A lot. Since assumed it was a safe day because my next period was supposed to be in 8 days we didn’t use protection. Well now my period was supposed to start yesterday but nothing. What should I do? Do you think I could be pregnant?