Hello I had sex with my husband on 26th may and soon after it ,I had a pill to prevent any kind of pregnancy. My period date is 20th but I got my periods 10 days before,but it lasted only 3 days and that too very less and brownish in colour.. and then on 17 i again got my periods ,but again the bleeding is so less..I did urine pregnancy test which was negative.. please help me coz m really worried what actually going on with me,as this is the first time m experiencing such an irregular cycle.. m I pregnant? Or else then why it is happening?