When is your next appt? If it's within the next couple of weeks, I would just wait and tell them then....but if it's a month away, you might want to just call and let them know.
I work 12 hour shifts and by the time I get home my legs are so swollen that it's hard to bend at the knees to get up the stairs.....I told my OB about it at my last appt. and they didn't seem concerned being my legs were the only thing that was swelling!!