Please HELP!!

So I have had irregular periods since I started having them...I also have PCOS. But me and my fiancé has been TTC for a while. Went to a reproductive doctor and I found out that I am insulin resistant, which his said could play a big part in why I’m not getting pregnant. So he put me on some medication to help get my insulin in order. He also had me start tracking my BBT. Still confused a little about it, but this morning my BBT was the highest it has ever been in the 3 months that I have been tracking it and I haven’t had a period this month so some input would be greatly appreciated!!. Thank you in advance!.😊