Yes, pregnancy is possible after tubal ligation surgery. I became pregnant 7 years after having this surgery done, but we lost our baby at 10 weeks, possibly due to low progesterone and are currently trying to conceive again. I have read stories of women who have had trouble testing positive after having tubal ligation surgery done, so depending on when you tested I would recommend doing it again and getting an ultra sound done as well. God Bless.
Well, I suppose the bubbles could be gas and the bloating/weight gain could be water retention? Hard to say, you should probably consult your Dr. Good luck.