Is the fluid in my stomach after tummy tuck normal?

Thank you for your question. It sounds as though you have fluid collection which is called Seroma & that need aspirations. Contact your physician to discuss the best next steps as soon as possible. 

Thank you for your question about the appearance
of your abdomen after your tummy tuck.  What you are describing could be
consistent with a seroma, but it is important to see your board-certified
plastic surgeon as soon as possible to determine whether there is a fluid
collection and possibly whether it is needs to be drained.  I hope this is
helpful to you.  Best of luck!