sex explained? reassurance needed!

My boyfriend and I had sex about a month ago, (I'm expecting my period soon)
But I am naturally a paranoid soul
We had sex he did not have any sperm in the pre cum because he did not cum before seeing me !
During the sex it was really full on sex he's just trying to stretch me out and make Sex more comfortable for me
So we had sex 
He took his penis out then I gave him a blow job for a while untill he actually cummed
So I know 10000000% no cum went into my vag because quite frankly it went all in my mouth ( ahah) 
So I shouldn't be worried right
I just kinda need some reassurance 
Safe sex I know ! It will in the future 
Just tell me not to worry pretty much 
Thank you in advanced !

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