Hello, I Had Unprotected Sex And Took Plan B The

Hello, I had unprotected sex and took plan B the day after. The day I had sex was 3 days after my period ended. I then got my period again a week after and it was bright red and moderate/heavy flow. It lasted the normal amount of days my period does. A few days after I got my period I felt tenderness and slight pain that persisted in my lower left abdominal region. It has been two days and the pain is still there, it is not severe but I definitely feel it. I am not throwing up and i am not nauseated nor do i feel any different besides the pain. I have noticed that just in the past 3 days i have gained stomach weight and yesterday i began to get a clear sticky discharge. Could it be an actual pregnancy even though I've had a normal heavy period for the past months or would it be an ectopic pregancy?