You wouldn't be able to feel anything, such as a baby moving until you are a few months into your pregnancy. (usually around 4-5 months ) If you are feeling anything it could be gas, digestion or even energy movement. The only way to know for sure would be a blood test. Urine tests can give inaccurate results but a blood test will know for sure. At any rate you will want to consult with a doctor.
If you are not pregnant and have been trying, do not lose hope. Most people do not realize that the majority of individuals wanting to start a family struggle with conceiving, especially if this is your first child.