hloo.i usually had perids 5 days before the last month perids time.had periods on 21 jan then on 15 feb.and in march it was to be on 10 march.but i missed.now on 19 march i had blood and white discharge both with back pain and cramps.breast has become too soft as per my friend.had sex on 7 march prior to my periods date.had negative test.feel tired if does any heavy work.legs get painful.is it pregnancy or not.do help out