i matted wid my husband on 13th feb , then i had intercourse 16th on 16th evening there were blood clots ...i got myself examined and after four days i was normal . I had my periods on 4th feb(first day)then i had intercourse on 4th march night( protected). once i had problem of delay in periods but normally i have regular period now there is delay in my periods are there chances of me being pregnant??? how much delay periods is normal ??