TTC at 31

31 and Been trying for 7 months. It’s so discouraging for me every month I get my period but my husband says to not give up. I don’t know what we’re doing wrong. I’ve been taking prenatal vitamins as my Dr. recommended them for preconception. I feel like we just keep missing when I’m ovulating, but then if I test for my surge I just get stressed out. My husband works shift work and so we can’t always time our sex. Any advice from fellow mammas here would be appreciated. Maybe I should just stop trying. Also,I’ve been having mild cramping on and off since 10 DPO so I’m sure my AF is on her way. But maybe I’ll be surprised this month who knows. I don’t want to waste a test too early.