Miscarriage, ectopic pregnancy, or corpus luteum cyst?

blaine1800

I am 7 wks pregnant and very worried. I've had a few days of brown discharge which turned into red blood (but only once) and then turn back to brown discharge which is showing up less and less. I did not have any cramping, only short shooting twinges of pain which are not bad at all and come only maybe once every few hours. My first dr appt is in 3 days, but I'm very worried. Has anyone had these issues? What were the results?