I had brown bleeding with DS between 4.5 and 7 weeks. Not enough to soak a pad but enough to make me terrified. Good luck I hope you have a happy ending too. That pg resulted in lil munchkin who has just turned 2 and is currently tucked safely in his cot . Btw I also had crampy period like feelings with DS's pregnancy until around 14 weeks. Hard not to worry but fingers crossed you and bub will be ok. Are you having another scan in a week or so. I had internal US at 5, 7 and 12 weeks but OB was extremely gentle when doing so. Wishing you all the best.