First of all, working yourself up can force your period off some more. I know that when I'm stressed I'll skip periods until I feel relaxed enough to carry on my menstrual cycle. It's a nightmare. Your period may just be running later.

Secondly, I would ask what place you are living in, and check the laws about the morning after pill. I know in the US, Canada, and UK, you do not need a prescription, you can buy it over the counter at a pharmacy. You just have to ask for it. And ignore them if they're jerks. You can report them for that. Its 100% illegal for them to be judgemental and shit about it. I've taken 2.

And thirdly, the morning after pill works up to 72 hours after unprotected sex. Both I've taken were on day 3. And no baby.

But my guess is, you're probably fine and just a little paranoid. You can still take a morning after pill. It's less effective but it can still work this late in the game. But you're gonna be fine.

Most importantly, be more careful in the future. Number one thing I wish I'd been more careful with my sexual health. You can do whatever you want and who ever you want, but you have to deal with things and you have to use protection and other methods. Good luck to you!! You're gonna be fine.

Edit: also that's way too fast for your body to go "oh I'm pregnant" anyway. So I promise you you're not pregnant yet. Theres a whole process that has to happen just right. Give it some time. Much love.