Advice on weird periods when ttc

Amber

My husband and I ttc last year, put it on hold for a bit, and have decided to try again in March. I’ve always had weird periods but this February one is 4 days late. Sometimes I go up to a week late or I’ll even skip periods. I’ve talked to my dr. He said I’m normal, but I don’t feel normal... I’m worried about knowing when I’m ovulating. I’ve tried the tests that tell you when you’re ovulating, but it didn’t work last time we were ttc. Can someone offer some advice or insight please?

Oh, and I’m not pregnant currently. I triple checked with a pregnancy test because, you know, God works in mysterious ways...