Can twins give you a higher hcg at 3 weeks?

While hCG levels can vary between pregnancies, it's unlikely that having twins would significantly elevate hCG levels at just 3 weeks of pregnancy. hCG levels typically start to rise rapidly in the early stages of pregnancy, but the presence of twins or multiples may not be detectable this early through hCG levels alone. Other factors, such as individual variability and gestational age, could also impact hCG levels. To accurately determine the presence of twins, an ultrasound examination usually performed later in the first trimester or early second trimester.