Wierd Situation...Involves Sex, Pre-Cum...

i went to my gf's house the other day and we immediatly started having sex...it only lasted like 10 min due to her tiredness...i did not wear any kind of protection..but also didnt cum inside her...i wasnt even close to cumming...i pulled out and she finshed me off orally...i dont even know if i pre-cummed...should i have felt it? i know there are possibilities of her being pregnant..with the situation given..what are the chances she's pregnant? could my "pre-cum" have gotten her pregnant"? should i feel it coming out?