Help!!

So my baby fever is at an all time high. And I’ve been trying to get pregnant. <a href="https://play.google.com/store/apps/details?id=com.glow.android">Tracking ovulation</a> and everything but nothing seems to be working. I’m only 22 and I have a 4 year old. I made an appointment with my ob. What should I bring up when I go ? What questions should I ask ?