Freaking out

My boyfriend and I had sex with out a condom BUT than ended up putting on a condom after a couple of strokes. He never comes in me when with the condom on and pulls out always. I get paranoid all the time after the fact could I be pregnant? Also yes I am aware you can get pregnant with pre-cum but I also hear you only get pregnant with the pre-cum before he ejaculates... should I get the morning after pill? Or should I be fine.

Ps Fértil window starts in two days.