Ttc number 2

Hi all, I have a 3yr old little girl been trying now for 8 months!! It's starting to take its toll on me all that's on my mind is wanting a baby. Just when I think I am pregnant because af is late bfn tests then af turns up. I had a mc in February was gutted!! I always get pain in my ovaries when af is here or about to show up but no sign so thinking im pregnant. I know people say you should just relax but it's hard when you want something so bad. Anybody in the same situation as me? Just want abit of advice and cheering up thanks x