Hello I appreciate your query. Ideally, it is not wise to meddle with the normal menstrual pattern, however this is an exceptional situation, hence I will guide you further. Today is already 29th November, hence if you start medicines to prepone your periods, you need to take them for 5 days and then you will have bleeding within one week after that ie. if you start from today , for 5 days, meaning till 5th december, you will bleed within a week after that, which is what you want to avoid. hence, it is more advisable for you to postpone your periods instead of preponing them. For preponing them, you should have started medicines a few days back. Anyway, you can start taking Tablet Meprate ( medroxyprogesterone acetate ) from tomorrow onwards till you do not want your periods After stopping this medicine, you will have your period within 3 - 5 days. So if you want your period after 10th december, you should take it till a couple of days before that. However, this is a hormonal preparation. The exact dosage depends on your body weight, and you need to see a doctor for an examination and to rule out any other contraindications for its use. Hope this answer was useful.