un safe sex

So me & my bf had sex, he pulled out on time and cummed no where near my vagina at all.
Just wondering if I'm fine? I'm supposed to get my period in2 weeks so my PMS symptoms start like swollen breasts and bloating 
I just don't wanna be parinoid and if no cum got in me then I should be fine?
I know about pre-cum but apparently it's very low in sperm almost nothing and not really proven to have sperm so besides that if he pulled out and cummed automatically then I'm ok??
Thank you 
And I'm planning on going on the pill soon!