HI and thanks for using the forum.
An ovulation tracker would be a good way to start. Ovulation can occur anywhere between Day 11 and Day 21 of your cycle depending on the length of your cycle (Day 1 being the first day of your last period). You are most fertile during ovulation so during this time you should have sex daily or every other day. You could also try OPK's (ovulation predictor kits). When you ovulate, you get a positive test result (these work like a pregnancy test in that you pee on a stick). OPK's can be expensive though, so it would be worth trying an online tracker first. I hope this helps. Good luck.
Get the "Period diary" app, put in your start and end date, and it will there will be a pink flower on your fertile days, on the calendar.