HCG Levels

I am 11wks 5days. I get my blood work done every week to check my progesterone and HCG levels. My HCG levels peaked at 58,000 when I was 9 weeks. Last week they dropped to 32,890 and this week they are down to 26,320. I know they are suppose to level off but I didn't know they were going to drastically drop like this. Has anyone else had this issue? I haven't had any bleeding.