Iam 37 years old unmarried. Last month had taken birth control pill for first time in life. Took 4 tabs n quit taking. Due to nausea etc. Had uncontrollable bleeding for extra 5 days. Stopped. But my problem is I did not have period this mon. Iam not at all sexually active. My last months period started at 28 dec 2015. Which I have usually of3 to 4 days bleeding but stopped on 5 jan 2015 as stopped taking pill, I took them from 28 to 31 dec. Stopped taking from 1 jan. Accordingly this months jan due date was 22 jan, not had my menses yet. Im not sexually active at all. So no need of urine preg test. When will my menses resume. Till when to wait. What to do. please help.