did anyone go to a fertility specialist due to not ovulating and having irregular periods? what did they do to help you get pregnant?

Ky 8-15-17👼🏼 & 10-28-17👼🏼 Pregnant with my🌈💕
Just wondering because my periods have been irregular and I'm pretty sure I'm not ovulating. We've been ttc for 15 months. I have my first appointment with a specialist next week which my obgyn referred me to. And I'm just wondering what the steps were that they did next for you?  I've had all of my day 3 labs taken and thyroid and blood sugar and all that checked by my obgyn and it was normal. And she faxed my records to this specialist