Many of us think of pregnancy as lasting nine months, but a pregnancy is measured from the time of the woman’s last menstrual cycle. For this reason, a pregnancy usually lasts about ten months. These ten months are divided into three trimesters. Each trimester lasts about 13 weeks.
Receiving an ultrasound is the most accurate way to confirm a pregnancy and to determine how far along the pregnancy may be. If you believe you might be pregnant, The Center for Life Choices provides free pregnancy testing and ultrasound services.