Can’t get pregnant

So, my spouse and I want another baby. Our first we needed help so we used preseed, it worked we had a baby he’s a year old now. 😊

We honestly have sex probably 5 times a week, maybe even 3 times in a day/night. We have been this way for months, unprotected & I can’t get pregnant. We’re thinking of going to a doctor to see what’s going on with us in the future.. just wanna hear opinions on what may be causing this issue