I started a low dose of Levothyroxene about about a week ago for hypothyroidism. It feels like my hormones have gone into overdrive. My last period also ended a little over a week ago and it already seems like my body is doing all the things it normally does a week before I get my period, which would mean this is all happening a few weeks too early. I also have PCOS, but my periods have been regular (not to the day, but to the week) for the past 2-3 years, so this has never happened to me before. Would the thyroid junk or the medication do this?