Vaginal Ultrasound/blood work checking for PCOS

So me and my husband have been TTC for 6 months now. I went off of my BC in April, and ever since then my periods have been weird, some long some short. Skipped a period completely in June thought I was pregnant, all rests came back negative. Aunt Flo picked up the next month. I finally caved and asked a nurse at my OBGYN if this is normal, because I’m not sure I’m ovulating. My OBGYN wants me to get blood work done, which I did and I go Tuesday for the vaginal Ultrasound. I’m worried about it obviously, but didn’t know if anyone has any advice or similar experience.