My period came on then 15 days later i spotted for two days now my period is due but it hasn't came?

Irregular menses: So the answer really depends on whether you had sex in the past 1-2 months. If yes, you should do a pregnancy test to see if you are pregnant, even if you used protection during sex (there is a small chance that protection can fail). If you haven't had sex, you might be having irregular menstruation. Keep a diary of your periods and see a gynecologist.