Urgent!!! Pergnancy chance!!!!

My self and my GF had a oral sex and we had hugging but in nude. During that action our both genitals (Reproductive parts) touch each other tightly but i have not inserted my penis inside the vagina but pressed tightly atmost for 2 min, i believe i would have had per cum fluid as well touching( but i pissed before this action)mostly outside of the vagina wall. Initially at the start i rubbed a liquid of drop (Pre cum), later after 2 min we gone to this action.

And  we dont know the placement of my penis tip on her vagina but definetly the placement more probably on the top of the hole (touching it) , its a just a tight hug almost. Secondly she not yet reached the climax and i am not had climax.. I am worried about where i position the penis, because we both not looked our parts and pre cum chances dont know ( after the inital pre cum).

She is about to get period from 10 days after this action. Is there any chance of getting pregnant by this action.Need truthful advise on this. This is the first time we tried and it happened this month 18/05/13. little bit worried about it.