i had my last period on the 11 of august,normally than again on the 19 of august i had another one but it took9 days which is not normal and was heavier.and from this date till 21 of septempber i didnot get my period is this normal or what?
i take medications for thyroid.
Having a late period is normal. Since an unbalance can be a change of anything. How active you are during sex, stress, your diet and exercising can be the case of a late and/or early period. I've had that happen before and was a few weeks late. Though your medication may also be a change, depends how long you've been taking them as well.
However, I would suggest getting a pee tester at a pharmacy. They don't cost overly expensive but are highly accurate about pregnancy percentages!