Gender Roles are Negotiable. Sometimes the woman wants to pay for a night out -- and sometimes it's the guy who stays home to raise the children. This means your old fashioned dating rules will have to be a little more flexible nowadays... and that is a wonderful thing.
Roughly: HCG drops at roughly the same rate it rises when a pregnancy fails, so an hCG of 400 can easily take 30 days to drop down to 10 or less. If you are concerned you should ask your doctor (or a doctor) to check a quant hCG again. ...
In a healthy pregnancy your HCG levels should double every 48 hours. But when the pregnancy is not progressing the way it should as in the case of chromosomal abnormality your HCG may rise at slower rates or rise at first and then start to decline. Low HCG levels do not cause miscarriage. They mean that the pregnancy is not healthy to begin with.