Chance of being pregnant?

Hey ladies! So I'm 17 years old. And before I start I would just like to say I know that I made a mistake and I would appreciate it if I could get some hopeful relief to my worries. So, back in April my boyfriend put his tip in me for less than 5 seconds tops, no protection, didn't cum. I've had all my periods full on (heavy & clotting, I get them pretty badly) but my next one is in 7 days and I'm still stressing over hoping I get it and also my belly button is an innie but it feels hard when I press down a little bit. I've been bloating a lot but I have also been eating very badly. What are my chances of being pregnant?? (and yes, I know unprotected sex always could lead to pregnancy but I use want to know my chances) also is that even considered sex?? (sorry I know I'm asking a lot of questions lol thank you in advance for your help it means a lot to me!)