If you have missed your period and tested positive for pregnancy, it is important to consult with your healthcare provider to confirm the pregnancy and discuss any symptoms or concerns you may have. Stomach pain can be common during early pregnancy due to hormonal changes and the stretching of ligaments in the uterus. However, persistent or severe abdominal pain could indicate an ectopic pregnancy or other complications. Back pain can also be a normal part of pregnancy as your body adjusts to the changes, but it's always best to get checked by a medical professional to rule out any potential issues. They will be able to provide you with appropriate guidance and ensure that both you and your baby are healthy.