BC and plan B

Erin

So I’m terrified of becoming pregnant and I usually take the precautions so that it isn’t even an issue. Last night I goofed and had unprotected sex and he didn’t pull out on time. I’m on the progesterone only pill and take it, for the most part pretty well. I usually take it around true same time every day give or take an hour. On the directions it says that within 3 hours I’m still protected. So with this being said should I take a plan B for an extra precaution and risk all the side effects on my cycle or just hope and pray that my BC is doing it’s job.