I had spotting early on with Sammy. It was more brownypink in colour and was not very heavy. Probably lasted for 3 days. I had an ultrasound in which I was told to prepare for the worst. I was having my hcg monitored and it was not doubling so was told it was not looking like a positive outcome. At 7.5 weeks though had another ultrasound and there was a beautiful little heartbeat flashing away on the screen. No further problems at all.
HTH..all the best

Jo