Help! Positive OPK on cycle day 7

Cj • Unexplained infertility. IVF mama of 👧👧

So I had 5 days of spotting last cycle followed by a 6 day period. That’s unusual for me and I did go see MD. I’m scheduled for a vaginal ultrasound next week and she did a couple labs that were normal. Now tonight, on cycle day 7-one day after I stopped bleeding,I have a positive OPK?! Any experiences with this? If I do ovulate this early will I have a mature egg that’s even able to be fertilized?