Possibility of getting pregnant...?

Kelsey • 21 |I like animals more than people🐝|Married 🌹| Tattoo and piercing supporter🤘🏻|PCOS fighter💕
I havnt taken my BC pill in 3days now because of some pharmacy issues. My bf and i had sex yesterday, and im fresh off my period (had been a day before we had sex, so im fertile i believe). It wasnt protected and he did finish in me, what are the chances I could be pregnant?