reassurance !!:((

So me and my bf had sex about a month ago
I'm expecting my period soon sometimes it comes a day early sometimes not
So basically: I know he did not have any sperm in the pre cum because he did NOT ejaculate before seeing me!
Secondly we had sex but not really, I'm stil pretty tight down there so I'm just trying to get comfortable with sex. 
So we did our sex thing not full sex to the point where he could feel to cum we never went that far, more like strokes 
Then he took his penis out and I gave him a blow Job for about a good 5 mins then he finally cummed.
I know 10000% no cum went inside my vagina 
Because I made him cum with the blow job
So I just need some reassurance not to worry 
Because I don't want stress to make my period late 
So please reassure me I know I'm 99% fine since my vagina was far away from cum. 
I was just worried about things I've heard about pre cum and Idk just parinoid But this would help me because I am naturally a paranoid person . I know I know, safe condom sex , I will absolutely do that in the future this was kinda in the moment thing 
Thank you 

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