Should I even take a test?

I have not had sex since Jan. While being sexually active I was on birth control and used a condom and he pulled out. I got my period for both Jan and Feb, both on time. I recently got off birth control and 5 days later I got a period (guessing withdrawal bleeding) which lead into the month of March. Am I pregnant, reason for asking is because Ive Been lightheaded and headaches . Please help