Question?

Just gave birth to a 24 weeker 10 days again due to PROM. Well last night I noticed my ankles and lower legs are swollen. I had a vaginal birth. I elevated my legs last night while sleeping and my right one went down just alittle bit. Im trying to stay off my feet as much as possible but my babies in the NICU and i cant stay away from her. I called my doctor but they were already closed. Any of you ladies have this after giving birth?