Is it normal for lopsided swelling post tummy tuck? 3 weeks post-op.

Thank you for sharing your question. Unfortunately without a full series of photographs or an in-person examination it is difficult to know if you are experiencing soft tissue swelling or a discrete fluid collection.  The former would be normal for a tummy tuck procedure and improves spontaneously with time while the latter may require intervention by your surgeon.  I would contact your doctor and ask to be seen and evaluated for the best advice. 

Keep your compression garment on,  Minimize your core motion and call your surgeon to have fluid aspirated.  Uneven swelling does happen, if you feel as if you are filling up with fluid you should call your Surgeon to have the fluid removed.