Should I Get Plan B?

I’ve been on the combination pill for over a year now, I take it at the right time everyday. My boyfriend & I had unprotected sex yesterday & the day before, but he pulled out & never finished either one of those days. I’m freaking out because we usually use a condom, but when you’re in the moment, sometimes that goes right over your head. Should I take plan b or am I overreacting? I know there’s always that chance, but Id rather not risk it.