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.. Beta hCG levels usually double about every 2 days for the first four weeks of pregnancy. As pregnancy progresses the doubling time becomes longer.. Hcg level chart by week of Gestational Age post LMP in hCG beta subunit IU/L: 2-3 weeks the HCG level is among 10-70 3-4 weeks the HCG level is among 10-750.