my cycles are sometimes irregular due to my thyroid problem but since i have been on my meds they usually i will start on the 5th or 18th of every month so far this month i have not had a period at all, i have been having period cramps but no period. my last period was on January 16th. I took a pregnancy test Saturday on the 22nd and it was negative could it still be too early to test? or could it be something other then pregnancy??i tell you the female body is confusing!!! i have a doctor appointment Monday next week for thyroid test if i don't start by then i was going to tell the doctor.