HCG levels 4.5-5 weeks

Sierra • Hi! My name is Sierra. & I`m a momma of a two year old girl (:
I found out Tuesday I was pregnant and my doctor did an US Is 9325 anywhere near normal? My doctor has me freaked out.  This is my first pregnancy no miscarriage history.  I'm worried.  But my dad is a twin and has lots of twins in his family my mom was pregnant with twins before she was pregnant with me. And there are twins on my moms side. My boyfriend has atleast 5 sets of twins on his dad's side. I'm not hoping for twins but If it's that or a molar pregnancy or eptopic I'll take the twins or a healthy baby. Any thoughts?