T.C.
There are a lot of different causes for a uterus to be larger than expected in pregnancy. There is almost no use speculating, because it could be totally normal for you, or the two possibilities you mentioned. If you were in an ER, they are really not experts in feeling the size of your uterus, so it could just be an unskilled examiner. The only way to know is to have an ultrasound by an OB... if you are having to wait for a while for Medicaid, you should just call anyhow. Prenatal care is free! It is very important to know what is going on with your baby and yourself :)