The information on this site is not intended or implied to be a substitute for professional medical advice, diagnosis or treatment. All content, including text, graphics, images, and information, contained on or available through this website is for general information purposes only. The purpose of this is to help with education and create better conversations between patients and their healthcare providers.. A quantitative hCG test (or beta hCG) measures the amount of hCG actually present in the blood. Guideline to hCG levels during pregnancy. hCG levels in weeks from LMP (gestational age)* : 3 weeks LMP: 5 – 50 mIU/mL; 4 weeks LMP: 5 – 426 mIU/mL; 5 weeks LMP: 18 – 7,340 mIU/mL; 6 weeks LMP: 1,080 – 56,500 mIU/mL. hCG usually doubles every 48-72 hours very early in pregnancy and there is also no single "normal" hCG level during early pregnancy. Implantation occurs on average 9 days after ovulation (range 6-12 days) or about 5 days before a missed period. hCG levels are detected in the blood as early as 2-3 days,.