@Elisa R,
There are many reasons for a changing shape at age 33, but tops among them is loss of muscle tone due to lack of exercise and/or a hormonal change.
That being said, if it were me, I'd make an appointment to see my family doctor to rule out any chemistry, nutritional problem or illness.
Weight (or inches) reduction in a particular physical spot, generally speaking, does not work. Furthermore, paying such strict attention to what number of pounds the scale indicates may misguide your efforts towards good health.