Slight brown discharge .. I'm at 8weeks. Is it normal?

Yes, at random points throughout pregnancy I believe brown discharge (old blood) is normal, even cramping. If it's bright red discharge, however, best to get it checked asap. If in doubt, consult your OB :)

Mild pain is normal in the early stage of pregnancy. Some times brown discharge can be old blood too but best is to let your gynae know and have the necessary check.