Ttc with irregular periods

My partner and I decided we were going to really try for a baby because we FINALLY found a donor. My main concern is I can go 4-6 months without a period and while i have an appointment with an obgyn I’m still just low key terrified I can’t get pregnant. Every month I still go through all the ovulation symptoms just no actual period.

Has anyone had any luck or tips for ttc with irregular periods?