can i get pregnant if he rubbed his shaft on my vagina???

so pretty much, i was the cool gf and gave him a bj, then hand job so he was empty :P
then after a while, we just layed there talking, fell asleep for 15 mins then just held each other, the i got ontop of him, and he said i wonder how it would feel "them" touching, we are both virgins.
so i was stupidly curious too, took my panties off, and all it was, was the shaft of his penis not the head, was slightly rubbing against my vagina, then i got up abit, he lift his penis, felt it for a second cause he was moving it, now there is a very slight chance he might ha pre came, just a tiny bit, he doesnt know.then he fingered me for abit. now nothing was inserted. just rubbed, but im scared i could be pregnant because iv been reading so many articles online whereeven a bit of precum can get u pregnant from just the outside of the body, i also had a fan on, that gave me a cool breath down there cause i was getting of of hm and fall a little right infront of it, was so cold :P
could i be pregnant or just worrying for nothing ? im due for my period any day now.

PLEASE HELP ME!!!!!!!