Welcome to HCM,
AS your husband had vasectomy
operation 12 years ago, you are on birth control and test for pregnancy
is negative, your problem "bloating around middle" seems to be due to flatulence
. When due to constipation
or poor digestion formation of gas is more, it can give you feeling of movement in your abdomen. Please eat fiber rich easily digestive food, consume more water & have regular morning walk. If problem persists, please consult a Gastroentrologist.
Wish you good Health,