Ay, mama, sharp pelvic pain with brown discharge at 8 weeks is something you really need to have checked by your OB or go to the emergency room right away, okay? Hindi kami dapat mag-assume dito kasi it could be normal pregnancy stuff or something that needs immediate attention, only your doctor can tell for sure. I know it's scary, but better safe than sorry talaga when it comes sa baby. A few of my mum friends had similar scares, and the peace of mind from getting checked was worth it. Please don't wait, go na, sis.