My period date this month was 9-12 nov. I had sexual intercourse with my partner on 14 nov and it was protected and I consumed I pill on 15 nov. I haven't went through withdrawal bleeding as its said that it usually happens after 5-10 days. But for past 3-4 days I was feeling massive cramps in my stomach and full lower abdomen including my legs. On 29/30 nov night I had seen spotting and cramps are continuous. Its red in colour and blood is in little amount as its first day. Is it my periods as my next possible date was to be 4 dec. So is it my period or withdrawal bleeding. please guide me.