Some Advice Please

Erin • Skyla IUD . Happily with my Army Man
Hey, so I know there are already a lot of pregnancy questions on here but I just want to know my chances. Please don't tell me, "well if you're not ready or old enough for the consequences don't have sex", that's so unrealistic. So I've been on birth control for two and a half years and I'm just about to end my period. I had sex twice today and the second time around, my boyfriend came inside me. We don't use condoms because neither of us have stds and I'm on birth control as previously stated. What is the likeliness of getting pregnant the day before your period ends? I assume low because I'm not near ovulation and my egg is completely gone. Thanks ahead of time.