getting pregnant!! 😤

So my husband and I have been trying to become pregnant for the last 5 months. And I'm still not pregnant. I have followed my eve dates for when I'm fertile and every time he cums in me, I keep track of it on eve. I put my legs up and we have tried different positions. I'm just at the point where I don't know what to do or try any more. (We do have a 4 year old, so it's not like I can't have babies, and I gave birth natural) I need some help or advice!?!?