Still not pregnant

Char
So I have a 3 year old daughter and I've been trying for a year to get pregnant again and the first time I tried it only took about four months this time it's taken a year I'm 35 and my husband will be 40 this year I don't know if I'm too old or maybe it's just not the right time but whatever it is is taking forever and I'm getting so frustrated 😔 we've been having sex on my fertile days any advice from anyone else thats going to this?