Enlarged uterus?

Karah • My husband and I have been together for 7 years and married for almost 5. We have two little girls (4 and 1).
So I had my first appointment with a midwife today. I had a chemical pregnancy last month and am fairly positive this is a new pregnancy. She did a pap and an internal exam and told me that my uterus was too large to be only 5 weeks and 3 days. She said I could be further along or possibly carrying twins. Anyone have experience with this kind of situation? I have a sonogram in 2 weeks.