I'm kind of stressing out... Plan B?

I know Planned Parenthood gives out plan B, but I'm wondering if you have to have an appointment to get it for free. My boyfriend and I had sex on a 3% fertile day according to Glow and for the first minute or so he didn't use a condom. I always get anxious about this ( it doesn't not happen often, but sometimes it's our way to make things more pleasurable.) Anyway, he pulled out well before he ejaculated because he finished himself off, but I've read that pre-cum can still get you pregnant. I'm worried about being pregnant and I know this Is a dumb decision if I'm not looking to become pregnant, but it happened. I'm not on any birth control because I have Type 1 Diabetes and it causes insulin resistance. So I guess my two questions are: Should I take plan B? Do you have to have an appointment at Planned Parenthood to get Plan B for free?