period 35-37 days on average..ttc

Hey y'all! I will be getting married in June and that's when my future husband and I will be immediately ttc 😊. I'm 33 yrs old..never have been pregnant nor tried to get pregnant. I'm concerned not only about my "advancing maternal age" (as my dr calls it 🙄) but especially trying to pinpoint my ovulation days, seeing that my periods are usually every 34-37 days. Any help would be appreciated! Thx in advance!