I had mine done via NHS (using a cut around the bottom half of the nipple) and was given an appointment for two weeks after the op as soon as it was done.
It was explained to me that the technique used would likely bleed internally a little as it heals (not to the extent of haemotoma), and that this appointment a fortnight later would be to simply drain the excess blood away.
Sure enough, in the space of those two weeks, it had "inflated" back up to the size it was pre-op.
A little bleeding is nothing to worry about (in the physical sense), you could get it drained, or wait for it to be resorbed back into your body (much like the blood from a nasty bruise), only the latter will likely take some time.
Certainly make a call to check yourself out, but I imagine it'll be alright.