Survivor since 2007
It isn't unheard of to have fluid continue to build up after drains are removed. They can aspirate off the excess fluid as this will probably make you feel more comfortable. I can only share my personal experience, once the drains were removed, there wasn't any more fluid. I would give your doctor a call tomorrow to check with him/her. They will be able to make a decision if you need to be seen again to remove the excess fluid.
Take care, Sharon