bleesing .. I pill.. 2 periods in one month..

I had sex and took I pill nxt day.. thn got period 2 days afyer dat only for 2 days. Usually my period is 6 days.. then I got another period after 3 days.. it is on from thn.. today is 7th day.. heavy flow from last 3 days.. what does this mean? M confuused n scared. Help!