I wouldn't call this normal, but it is not rare.
Women after c-sections, delivering an 8 pound child plus similar weight of placenta often go home weighing more that when they were admitted.
At two weeks I wouldn't necessarily expect this to persist to that level. I don't know from your question whether or not this swelling is abdomen, legs, etc. At any rate a call to your surgeon is in order. There are many possible contributers to this, some of which would demand attention, including, for example, blood clots to the legs, which are a known risk for this type of surgery. Fluid collections at the surgical site is another possibility. No online consultant will be able to evaluate.
Thanks for your question, best wishes.