Starting to track ovulation

Hey ladies so I currently have 3 kids I miscarried in Dec. My husband and I are desperate to have one more. I've never had to track anything as I had my children in my twenties. I now have to track everything as it feels so difficult now to conceive. I'm still learning about tracking ovulation but all this tracking body temp and cervix I don't. Can someone explain all this to me please! I really want our rainbow baby. Please help!