Just made a big mistake and basically had unprotected sex last night (I forgot that my doctor told…

Just made a big mistake and basically had unprotected sex last night (I forgot that my doctor told me not to treat the birth control like a contraceptive for about 2 weeks, especially since the mini pill isn't as effective). I just started the birth control a few days ago. I absolutely do not want to get pregnant right now, my baby isn't quite 2 months old yet. 😥