Hi Penny-
If you have a little fluid accumulation, the cardiologist will probably give you some diuretics to clear it out. Joe has had a thoracentesis (fluid removal with a needle) but that was because it couldn't be cleared out with diuretics, and he was in very bad shape. It doesn't sound like you're in that bad shape yet. They prefer to do the easiest and least invasive things first. And there are many diuretics that can be used from very mild to "WHOA, get outta my way!", and in the hospital, there are even more powerful ones that require a catheter they are so strong. Also, if you have any infection, they probably won't be going into your lungs invasively. I'm sure they will use diuretics first for quite a while before doing that.
If you haven't been finally discharged from your surgeon yet, you can call him/her and ask their advice also. It's very good that you are seeing the cardiologist. Do not hold back on what you tell him. Every symptom means something. If you can't sleep without several pillows to prop you up, that means something. If you are waking up gasping for air, that also means something. If you can't do anything without getting short of breath and find yourself fatigued and sleepy, make sure you note that also. As a matter of fact, write everything down so you don't forget what to say. If you can, have someone else go with you, because if you aren't feeling well, and are nervous about this, you could easily forget what is said.
I'm sure they want to be sure that this fluid situation clears up and that there isn't something else going on.
My guess is that in a week or two, this will all be on cleared up and you will be feeling much better.
Keep in touch and let us know how things are going.
If you get very short of breath before you have the card. appt., please get yourself to the ER with all due speed. Let others know that you are not feeling well, so they can keep tabs on you. But don't hesitate to get yourself the help that you need.
This is something that can be cleared up by the docs.
My husband has had many, many, many bouts with fluid retention, some mild, and some very serious. He's still here and so will you be.
Take care.
How good should I feel by now at 5 weeks post-op? I seem to be going backwards! I am back to sleeping in recliner half the time because I cannot breathe when lying down. Evenings seem to be the worst time for me, I just can't get my breath. 
