The normal hCG levels at 5 weeks LMP is 18 – 7,340 mIU/ml. The hCG level in your blood doubles every two to three days when you're pregnant. If your hCG doubling time is slower than expected, or if it decreases over time, this may be a sign of a miscarriage or an ectopic pregnancy. An hCG level of less than 5 mIU/mL is considered negative for pregnancy, and anything above 25 mIU/mL is considered positive for pregnancy. It can take a variable amount of time for hCG levels to come to normal after miscarriage but it usually comes to normal within 2 weeks after miscarriage.