My periods first day was on 21/5/ and on 6th day that was 28/5/ I had a unprotected sex . Last month I took Birth control pills . This time my cycle was of 36days . On 6th day of my periods I started taking Birth control pills (recommended by doctor ) and on 8th day I was worried and took unwanted 72 (after 24 hours ) Today on 31st I'm feeling very heaviness in my stomach . Is this sign of pregnancy ? And before my periods start I face this problem monthly ,"bleeding does not start but it just has very minutes blood I feel and does even show any spotting during two days before before my actual periods come " . This problem I have from last 2-3 years of for periods .