What area are you in, might be someomne close who can check and back you up on it.
They are separate systems, so most unlikely to be related, but stranger things have been known to happen - even co-incidence. As normal practice, it's advisable to change the fluid as part of the process, if not following the 24 month recommendation.
Is there a chance the mechanic who did the brakes could have taken it out and abused the clutch - or that he simply changed the seat position and you didn't get it back in quite the same position and aren't depressing the clutch correctly as your timing is a little out/