No -- seromas sometimes follow surgery and depending on their location, can be tricky business.
You need a consult.
A bit of friendly advice -- don't argue with nurses over the phone. Better to assert yourself gently, playing broken record if necessary, and insist on seeing the doc tomorrow, ASAP. This thing worries me and it hurts, damn it!
The exam room -- that's where medical battles are won or lost -- behind closed doors. You can rarely win talking with a nurse, but you can lose big time. They are the gatekeeper to the physician.
Ask for an appointment to go over your diagnostic films, and to get some treatment for pain.
I'm sure this is a problem they'd rather not deal with, but deal with it they must, and you should not have to wait a month in pain when steps can be taken to reduce your pain while the seroma has a chance to reabsorb and heal.