Messed up period

Hi all, looking for some hope before seeing OB.

The past 3 months my period has been all over the place. A week late one month than a week early the next etc. I have always had a very regular 27 day cycle. I track ovulation so I know that recently I have been ovulating really late and getting my period early. Meaning my luteal phase is suddenly 9 days instead of 13/14 as it usually is. Anyone else have this?? Or know what could be the cause?

Thank you ladies!