My god, the stuff we deal with -_-

Okay so, me and my fiance are trying and long story short. I have irregular periods anyway my period came sooner 'no surprise lol' lasted 5 days ish it was extremely light for 2 . Anyway. No more period today it ended in the morning. Anyway. ( what your about to read next is tmi sorry) .oh and just putting it out there it happens I wasn't embarrassed lol he loves me I love him. $h!t happens lol. Anyway.....we had sex and we noticed a little blood Anyway we cleaned up, I figured it was (left over blood???) But it was really red. So whatever I put a tampon in and I took it out (been 1.5 hour) and it's very light pink and there's not a lot . But it was the way it was on the tampon it was weird. 3 lines, I dunno how to explain it but, any idea why it was so pink.? There's a chance I could be pregnant I suppose right ? I dunno lol.