How long will it take 2 get my menses? I took the medicine 3 days back.?

Im suppose 2 get my menses 5 days back coz i had the chances 2 get pregnant. So i met the doctor and had urine test. According 2 the doc, the test result was negative, no sign of pregnancy. I told him tat i want to get my menses. So he gv the 2 pills n ask me to take one per day. I took it on the day i met the doc n the next day. It has been 3 days. He even told me tat i wl get after 5 days. Im juz not sure abt it coz thr is no any sign of getting my period till 2day as i normally do. I'll hv stomach cramps n aches on my . Im confused here.