So my bf & I were in bed together having fun. We still had our clothes on but my pants were off (I still had my underwear on). He was penetrating me slowly to let me know he was erect (still had his clothes on). 5-10 minutes later he took all his clothes off & inserted into my vagina without a condom. Is there a possibility for me to become pregnant from pre-cum? Do you think it died, dried up, wiped off onto his underwear before he inserted into me?