Could be a threatened miscarriage. That happened to me at 7 wks and i was put on bedrest. Good luck!
It could mean a miscarriage coming, unfortunately. HCG should be doubling every 24-48 hours in early pregnancy, and if it's not it's usually a sign of a miscarriage coming, and bleeding and passing tissue is also a sign of a miscarriage. Some women do bleed in early pregnancy, and some have slow rising hcg levels, so I would be preparing for the worst and hoping for the best, I'll be thinking of you hun!!