I am 21yrs old and weigh 73kg. I had my periods on 11 august and was sexually active after my periods. There by I had my periods again from 21 august and which were not complete in flow lasting four days, after that I missed my periods in the month of september, also I have an irregular cycle. Suspecting for pregnancy I did pregnancy tests which all came out to be negative and after few days I have had my ultrasound of lower abdomen on 5 october which revealed no obvious abnormality but my endometrial thickness measures 3mm. I consulted a gyne and she prescribed me overall-G tablet to be taken for 21days, but as of now there is no sign of periods although 1week is still left because 21 days will get over on 27october. Please help.