Mini pill--just stopped pumping

So I've been on the mini pill for almost 3 months now bc I was exclusively pumping after baby was born. Gradually my supply went down and I started supplementing and about a week ago I quit pumping all together. I haven't been to the OB yet to get a different form of BC but I take the pill at the same time every day and my fiance has been pulling out. Well last night I guess he just got caught up in the moment and didn't pull out. I've read that without breastfeeding/pumping the mini pill is between 91-99% effective so I'm freaking out! I think I should have him pick me up Plan B just to be safe...? I have a 5 year old, 3 year old, and 3.5 month old and DO NOT want to get pregnant right now, probably not ever again. I should have had my tubes tied since I had a c-section and I'm 30 and he's 35 but I was scared to commit to it at the time. Anyone else take the mini pill after they stopped bf? I'm pretty sure I'm going to take Plan B this afternoon but I guess I just wanted opinions and kind of just wanted to vent since my anxiety is through the roof right now. Thanks in advance.