Momshie, side pain sa early pregnancy can be normal, maraming of us experienced that around 5-6 weeks from round ligament stretching, pero with your brown discharge and sore breast earlier, mas safe talaga na i-confirm mo ito with your OB para maging sure, lalo na since you're only at 5 weeks pa lang. Better safe than sorry sa ganitong stage kasi marami pang pwedeng possibility, so get it checked out agad okay?