hypothyroid! My periods are regular?

Yv
Hi ladies
Recently i discovered i am hypothyroid after bloodwork. I gained weight this past month, felt tired and just felt like something was off. My period have always been regular 31 days although for two months they stretched to 33 days. I seem to get to positive opks but now that my blood work came back. I wonder if i am even ovulating. My TSH result came back at 27.8. I started meds a week ago but now im worried this has added to my fertility issues. Anyone been diagnosed with a slow thyroid but u have regular menstrals?