HCG Levels

Hey,

I found out I was pregnant on December 22nd and began to miscarry on the 1st. My levels were only at 242 and a couple of weeks later I tested at a 48 which was a week and a half ago. My doctor had told me I can try as soon as I feel ready due to it being a very early miscarriage. I took a pregnancy test today and it was positive. I’m just curious as to how long it took for you guys levels to drop to zero. I was at what I thought was 5-6 weeks. Not sure if my positive is old pregnancy or new. I know it’s a junkie blue dye but it’s all I had on hand. I got another quantitative blood test today but I’m just on edge and need whatever insight I can get for right now.