Lost my virginity

I lost my virginity today at 16. I decided I wanted to sneak my boyfriend i havent seen in months and we started going at it. We did not use a condom or anything and everything lasted for only 30 minutes but we both did not ejaculate because of lack of time at hand. I also am ovulating this week, Is there anyway I could be pregnant? How can i tell i could become pregnant? Also when does pre-cum/ pre ejaculating start? Very nervous here haha