plan b?

Cailey

so I've been on the pill for 6months, but I switched to the ring last Friday. I just started my period last Thursday and they told me to use back up for 7 days. I'm an idiot and I totally forgot this and my boyfriend and I had sex last night and he finished in me. I also just got off my period 2 days ago. do you guys think I should go get a plan b pill? I seriously feel so stupid!