HCG levels

Brittany
Has anyone had their HCG levels drawn really early? And have the fluctuated? I had mine draw on Thursday and they were 43..Saturday I had it drawn again and it was 40 and Sunday it went up to 45. I am not sure if this is normal. Based on my last period I would be approx. 4 weeks but I believe that I ovulate late and am only about 2 or 3. I have also been spotting slightly the past few days but I was told this was normal. Thoughts/suggestions??