My old friend has bariatric surgery about two years ago, because she wanted to be pregnant again. Her second pregnancy was very scary and she nearly lost her life. She was bleeding! Her doctor convinced her to not get pregnant again or lose weight. She had to make major changes like Paleo lifestyle. She had a help from a personal trainer. Her personal trainer told her to stop with the cardio and go for weightlifting workout instead. There was an article about too much cardio exercise stall weight loss. I am sure you can find it online.
Anyway, she finally had lost weight for the first time all her life and her vitals are back to normal. She had gotten pregnant for the third time and the birth delivery went so well for her. Very beautiful baby girl.
Good luck with surgery!