I m 34 years old, generally healthy, have hypothyroidism which I am taking synthroyd for (for a few years now). My period is late, and I feel really bloated and have diarrhea for the past week. I had a 40 day cycle a few months ago, and typically have a 30-33 day cycle, I m currently on day 36 and no period. so I m not sure if it has something to do with my medication, if it s age and I m going thru early peri menopause, or pregnancy. I had protected intercourse a couple of weeks ago....any ideas?