Understanding Bleeding & HCG Levels in Early Pregnancy

Question
I am 20 years old and this is my first pregnancy. I am currently 7 weeks and 1 day by ultrasound. I noticed about two days ago a brown old blood discharge and my husband took me to the hospital. They did all the blood work and told me everything was fine, but to follow up with my doctor on tuesday. I called my doctor on monday morning and they wanted me to have my Hcg levels drawn again at the same lab as the day before. I went at about 23 hours and the took the levels again and they had droped, but only by 300 my doctor came in the room and told me that I had allready had a miscarriage, but she wanted to do an ultrasound to see why. She told us that the chance of my baby being okay was less than 1%. She started the ultrasound and the heartbeat was very healthy! The baby had grown since the ultrasound before and everything looked good she said. She wants me to have my levels checked again tomorrow and she gave me Prometrium 200mg to take 1 p.o qd for now. I am still bleeding about the same rate some in small clumps and some not it still for the most part looks old and I am not cramping. Have you ever heard of this if so what is it? Is there a chance that my Hcg levels can go back up? Or is 300 in 23 hours not enough to consider a drop. I don't really feel like I am getting any answers and I just really need some. Thank you for your help. Please tell us what you think.

Answer
The bottom line is that if a sonogram showed a normal fetus with a fetal heartbeat, it really does not matter if the HCG is dropping slightly. I would, indeed, repeat the HCG levels twice (48 hours apart). If it is a viable pregnancy there should be a doubling of the results in 48 hours. However, as long as there continues to be a fetal heartbeat, there is no indication of a miscarriage. The bleeding may be a "subchorionic bleed" that sometimes occurs in the folds of the developing placenta. The bleeding may or may not cause a miscarriage. YOu will have to just wait and see what the next sonogram shows.