At 4 weeks pregnant, hCG levels can range from about 5 to 708 mIU/mL. However, its important to note that every pregnancy is different, and hCG levels can vary widely between individuals. Additionally, hCG levels rise quickly and exponentially in the earliest days of pregnancy, usually doubling every 2 days before reaching a steady level around week 10, after which time they slowly decline.

Its also worth noting that hCG levels are not the only factor in determining the health of a pregnancy, and low levels of hCG do not necessarily indicate a problem. If you have concerns about your hCG levels or the health of your pregnancy, its best to speak with your healthcare provider.