should I get plan b if I'm on the pill?

Kaylyn • 20, little/kitten, licensed cosmetologist and Wiccan 🌙
I freak out if I'm that 1%. And try to be cautious. I've been on the pill for 6 months now and I've never missed a pill, and don't take it past the three hour mark. My boyfriend came inside me several times and I want to know if it's a good idea to just pick up a plan b to be safe than sorry?