just had my baby.. could i be pregnant again!?

Ok lady's I know first thing your gonna say is go to your doctor... BUT I want some advice.. I just had my little Boy 7 weeks ago... I'm on Birth control Pills Im on Day 18 of them so I have not even finished one full birth control pills packet... I had sex with my Boyfriend 3 days ago and he cumed inside me... (he said he didn't mean to) THEN today he cumed inside me again but this time his excuse was "your on Birth control so your not gonna get pregnant"... I know after you have a baby you can easily get pregnant again right after... so my question is.. even if I'm in Day 18 of my birth control pills... COULD I STILL BE PREGNANT? because I have not finished my full package of Birth control. Any response is much appreciated 💕

UPDATE: Yes I've gotten my first period sense having my baby.

Update:My use of birth control is the Mini Pill... and THANK YOU SO MUCH EVERYONE FOR YOUR COMMENTS! SUPER HELPFUL!!