Low #'s

I hope I'm in the correct group. I got a phone call 2 weeks ago that has us in a whirlwind of emotions. We were confirmed pregnant, but my HCG number was so low they called it a biomechanical pregnancy. I was told I would miscarry over the weekend. True to their word, I bled hard for 4 days. I had a re-check to confirm my numbers 0'd out, but they shot up to 40. Each time we retest they have slightly increased. My less than compassionate Dr said that they would go down and "the pregnancy would fizzle out." 😲 Well they just called and they are still gradually rising. Has anyone experienced this? I'm 5 weeks 3 days with a number of 69.