1st month TTC

So this past month was our first time trying. I've always kept track of my cycle. I got my period. & im just trying to find out if it's normal to not get pregnant when you keep track. We had sex every 2-3 days until after I ovulated. So I thought for sure.. I was checking my cm & didn't ever notice ovulation mucus. I'm 22 & my daughter is about to turn 2, so I didn't think it would be hard. Any advice is gladly taken.