Beta hcg levels???

mombie.89💕👦🏽👦🏽👧🏽👦🏽👼💕 ttc

I went into the doctors @ 5w1d for painful cramping. The doctor did a transvaginal ultrasound and took some blood. The ultrasound showed a gestational sac and yolk sac, and the doctor said the pain was coming from cyst on both my ovaries. I got the levels back today but I'm still confused on how it works and why the range is so wide