I Had My Tubes Tied For Years Ago Had Two

I had my tubes tied for years ago had two surgeries done on my right side we're moving 2 tumors could the doctor have untied my tubes and sew them back up they were cut tied and burned now 8 months pregnant all my pain is on my right side could the doctor have screwed them up accidentally or is it possible to be pregnant 4 years later after tubes have been cut burned tied everything is fine on my left tube.