You will probably start feeling what they call Braxton-Hicks
contractions at any time. It is a tightness
in your abdomen that can last anywhere from a few seconds to a couple of minutes. They are not painful, sometimes uncomfortable and VERY sporadic. Drinking a glass of water can make them stop, or changing position sometimes works too. Later in pregnancy, they will become more frequent and possibly more uncomfortable, but are perfectly normal and your bodies way of preparing for the real ones.