un protected sex *fixed

Okay so me and my bf hadn't see each other in a while, we didn't plan on having sex but I happend and we will use protection in the future 
So basically we were in the car he did not cum before seeing me so no sperm in pre cum (yes he could pre cum but doesn't mean it had sperm )
He went on top of me and he was going in and out rough ( that's how we like it lol if makes difference)
It was for about 5-10  
He took his dick out and I gave him a blow job for like 3-5 mins and THEN he cummed all in my mouth so I know no cum went inside my vagina 
Just need some reassurance so I don't stress and delay my period which I probably already delayed by overthinking 
This is all greatly appreciated thank u so much