Hey
From what you saying, the chances that you're pregnant are pretty much zero.
You are on birth control
He finished in your mouth
The toothpaste would have helped in killing the sperm, and you did rinse it out
He went down on you, but probably didn't go in
As far as safe sex goes, this is probably one of the safest (pregnancy wise)
I think you'll be fine, especially because you are on birth control. Chances are never absolutely zero, but this seems pretty close.
If you're really worried, wait 2 weeks and take a test. Don't worry too much tho, it's nearly impossible for this interaction to have resulted in pregnancy
❤️