i would take it easy and call your doctor tell him/her what happen.good luck to u and congrates on pregnancy:)
Could be implantation spotting from when the baby attaches itself to the lining to grow.
you should be fine aslong as it's not heavy and have severe pains...im 10 weeks 1 day and last week i had pink/red/brown discharge for 3days not heavy or nothing and no cramping had my scan and babys fine heartbeat still strong :) but if you are worried go to emergency doctor but it is common :) hope this reassures you i know what its like to panic about it but for yours and babys sake try not to stress