Many women have mild bleeding early in pregnancy. Sometimes it may be the first sign of a miscarriage, and sometimes it goes away and the pregnancy continues normally.
By the time you're 6 weeks, an ultrasound can usually tell whether this is a normal pregnancy or not. If a heartbeat is seen, then the pregnancy will almost always continue normally. If not, it usually means a miscarriage will occur.
I would call your doctor so that an ultrasound can be scheduled. Sometimes it's also helpful to check your hcg levels.
Whatever will happen is already determined, so there is generally nothing you can do to change it. We usually advise against intercourse or vigorous activity until there has been no bleeding for a week. Best wishes, and I hope a heartbeat will be seen.