Pull out method while on antibiotics?

I was prescribed amoxicillin for strep throat for 10 days and I'm also on the combo pill which I take on time every day. My boyfriend usually cums inside but he just pulled out instead while I was on my medicine. We dont like using condoms although we should have during my antibiotics and after while the pill kicked back in, but...

Is the pill 100% ineffective while on antibiotics?

How likely am I to get pregnant?

My period/placebo week is next week and I'm getting anxious.