ok so the Situation is that my girlfriend and i were fooling around and i put the tip of my penis inside her only for 3-4 seconds, i was absolutely dry when i did, she was very wet.

also to be noted that i had masturbated about 5-6 hours earlier but right before the act i had urinated with a strong flow.

yes, i am aware that what i did was not smart or responsible so please keep your judgements to yourself.

now my question is that can pregnancy be possible? 

the other complication is that every third cycle my girlfriend has is quite difficult for her, she is in the PMS phase at the moment. this will be her third cycle. i am quite concerned about this, please do help so that there i some clarity.