My period was 3 days late. i had a regular period last month. i had no sex this month. my body doesn't feel like i'm having a normal period though.

Pregnant?: You intimate that you may have had sex last month. This would mean that you are possibly pregnant and that your "Normal" period was not exactly that. Consider obtaining a home pregnancy test which should be flaming positive if you are indeed pregnant. However, a more likely cause for a 3 day late period is just regular variation in your cycle.