AF came today and I’m mad!!

So it’s hard trying to conceive. I’m 25 my man is in his late 40’s. Next cycle I want to track it and see if it works. Please any advice is appreciated. How do I track ovulation. I’ve been using this app and well it hasn’t worked I used preseed once and it was a mess. We don’t need lubricant so.. he kept slipping out lol... so plz plz someone help I really want at least one baby 💕