So My Boyfriend And I Had Been Fooling Around, We

So my boyfriend and i had been fooling around, we did not have sex or anything. We dry humped (i had only basketball shorts on with no underwear and he had nothing on) . He also fingered me with pre cum on his fingers. It's been 5 days since that's happened and i'e been VERY stressed about it every day. My period was supposed to be due today and I'm having head aches and minor lower back aches. Is this due to stress or pregnancy? and whats the possibility that i could be pregnant? PLEASE HELP