I'm 4 weeks pregnant today and had blood work done to check my HCG levels on Friday and yesterday. My Dr called me today saying that the levels were 13 on Friday and 16 yesterday and she had expected the number to double. She's sending me for more blood work tomorrow. I looked it up and normal levels at 4 weeks is between 5 and 426 but 16 seems so low. Has anyone had these levels this early and still had a healthy pregnancy?