Question

Hello! I'm 18, I just graduated highschool. I'm really nervous to post this, I never posted anything before. My boyfriend and I have sex often unprotected, but each time is only for 3-4 minutes AT LONGEST and he's never came when we have sex. On last week Monday (may 23), I gave him oral and swallowed all of it when he came. Between 30 to 60 min later we had unprotected sex. Is there a big chance I could be pregnant? We also had sex again for maximum 3-4 min again on Friday and Saturday (May 27, 28) and on Friday he came later on, and Saturday he didn't come at all. Both Saturday and Sunday I've experience frequent urination. Also I'm gonna get birth control on Tuesday! I want to get the Depo shot. How would the information I just said effect that, do you guys think? Thank you! 💞