Emergency Contraception

I am so ridiculously embarrassed about this, but my boyfriend and I had unprotected sex last night for the first time. I had always been very adamant about always using a condom, especially because I'm not on birth control yet (I made an appointment to see my gyno when my bf and I started dating in December and I've had a total of 6 appointments scheduled, Everytime my appointment comes around, my doctor gets called to the hospital so we've had to reschedule) but yesterday we had both had a couple rough weeks and even though he didn't have condoms, we both just really wanted to have sex so we said fuck it and had sex. He pulled out, I'm at my lowest point of fertility in my cycle, frankly I didn't finish this time around because in the middle I started stressing bc we weren't using a condom (which not having an orgasm lowers chance of conceiving), and I took Plan B today. Basically up until I bought the pill I was very calm, but once I walked away from the pharmacy counter I burst into tears, and just kept crying in my car while I took the pill. I have no idea why, and can't figure it out. Maybe this is melodramatic and none of y'all have the experience to help or explain why I can't stop crying over this but if you can, please help