not necessarily. some women produce large amounts of hcg (the hormone that is detected in a pregnacy test) with a single fetus. be patient. you will either find out when you have an ultrasound (most likely) or when two babies surprise you in the delivery room (those kind of surprises are rare anymore).
how can you tell if you're pregnant with twins? . i have taken 2 home pregnancy tests and they both came back positive; plus i missed my period 2 weeks ago. the home tests were instantaneously positive (literally took 10 seconds to see the positive signs) - is this a sign of twins?