I'm dizzy, i have cravings, i'm lightheaded, i have heartburn & my nipples are bigger. can i be pregnant even though my period came just in time?

Maybe . . .: If you've engaged in unprotected sex, then yes, you may be pregnant. What you interpreted as your period may have been an implantation bleed. Check out http://www.mayoclinic.org/healthy-living/pregnancy-week-by-week/expert-answers/implantation-bleeding/faq-20058257. Best way to find out if you're pregnant (or not) is to take a pregnancy test. Then go see your doc for prenatal care OR birth control