Can it be twins with normal hcg levels?

Rachel
My HCG levels are pretty much exactly doubling. They should be around 4000 today and I'm 5 or 6 weeks. Does this mean I'm probably not having twins since it's not jumping higher? I used clomid and my husband's side has a bunch of twins and I just have a gut feeling I'm gonna have two boys. But since my HCG levels are super normal does that mean I'm probably not?