Had gall bladder removal surgery (laprascopic) developed ascites afterwards, is that possible?

It is: It is possible if you developed it. You surgeon needs to find why. Is it cardiac, liver, kidneys, inflammation, etc. Talk to your surgeon.

Unusual: Should see and ask your surgeon. Fluid intraperitoneally may just be from fluid (irrigation) used during surgery . But other possibilities include bile leak or bleeding or pancreatitis, if you are not improving, get followup and find out what the ascites is and why you have it- underlying liver disease , heart failure etc.