Help! HCG and Implementation bleeding

[MiaAnn]

Hi ladies.
I had a HCG blood test done 4 days ago, which was on 2400. I was 5+1 at that time. My doctor told me that number is VERY low. The doctor almost didn’t want to give another blood test. I had a scan the same day, because I was bleeding and they saw both the pregnancy and yolk sac. I know that I need the other blood test to compare, but I am not sure why she says it’s low. I will do another one tomorrow. Also how long does a heavy implementation bleeding last?
Thank you.

My hcg levels were only 82 at that point so there not low am now 22weeks with a healthy pregnancy so nothing abnormal at all with your results x