Talk to Gynecologist on 13 Days Late Period,negtiv Pregnacy Yet.

its been 13 days up from my period date which was 10th of oct and athe 3rd day of that i start taking dufastone so that i can have my period on time but aftr having 10 tablets there is no period or even i test and there is no sign of pregnacy.on 20th oct i test n it negativ. till now i didnt test.plz someone guude