My last menstrual date was 5th may I generally have 25 day cycle I had an intercourse on 27th and 28th of may and every time we used condom and on 28th I had an ipill for double protection and also checked the conforms after the intercourse it was perfect. But after intercourse is on 28th may I got bleeding and that lasted for just a night and again on 30th my period started and lasted for 5 days. Is there any chance of pregnancy and from where should I calculate my cycle from 28th or from 30th.