Am I pregnant!!'

Got my period on the 23rd of feb  light bleeding, the next day was medium I was like okay I'm good then 25th it's nothing just brown when I wipe very light coloured am I possibly pregnant?!? period is usually heavy for 4-5 days i have sore breast n have bad abdominal pains for couple weeks now. Three test back in feb of 27th negative results expected period due Friday march 21st. I have gained 7 pounds and it's just in my stomach it's a massive round gut