sex and bc

I've been on bc for the past month and 3 weeks (starting tomorrow). Today i had unprotected sex with my bf. I'm freaking out if he pre cummed in me the two times we did it. Like I know he cummed for sure after bc I gave him head to cum. But I still have the thought of precumming in the back of my head and getting pregnant from it. It's our first time doing it like this and I just wanna know advice whether I should take the morning after pill. Plus I've been spotting since last week on the pill and my period is suppose to start Monday.