Should I be worried?

Ultrasound from 18 weeks showed high fluid levels, so I'm getting another one in two days to confirm, but was told not to worry, it will just be some more testing to why the fluid is so high, I was surviving on two hours of sleep, I didn't get much sleep due to a sick toddler, so I wasn't really focused on anything at my appointment and I didn't really hear much of what the doctor said, lol ooops..but does it cause problems is my concern? I feel okay during my pregnancy, I'm mostly just tired, exhausted, sore swollen feet and out of breath, but I still go about my days okay..