Hi Doctor. I Have Irregular Periods I Don't Get My

Hi doctor. I have irregular periods I don't get my period for two or three months . currently I am on vacation with husband and I my period was late the Dr prescribed duphaston 10 mg twice I have been taking it for 6 days and now I started seeing black spotting can I take 3 pills a day because I don't want to have the period since I am on a vacation which involve sports activities