I lost virtually nothing in the first two weeks - in fact I came home 5 pounds heavier than the day of surgery. Lots of fluids (IVs), gas, swelling etc. from the hospital stay. So the 2nd week, I finally got down to my pre-surgery weight! After the first couple weeks, the scale starting moving down pretty quick. Had a stall around week 10, starting drinking a lot more water, and I've lost 5 pounds in the last 2 weeks.
You're doing really well. Don't try to compare yourself to anyone else. Everyone heals at different rates depending upon how fit they were pre-surgery, preexisting conditions like diabetes, high blood pressure etc. Listen to your body, rest when you need to, drink plenty of fluids and be very cautious as you start adding foods into your diet.