help PLEASE I'm begging you I don't care if I'm being annoying help๐Ÿ˜”๐Ÿ˜”

According to Glow and other sites I ovulated on the 18th of November. On the 12th my boyfriend and I got intimate and at one point his penis did enter my vagina but just the tip. He pulled out immediately. This happened around 11:30ish PM. Could it last until the 18th and get me pregnant? For some odd reason on the 20th I had really bad lower abdominal side almost felt like I ovulated that day but I just don't know. Should I be scared of just precum alone and nothing else? He urinated since his last ejaculation?