Depo... Need advice?.

I got my depo shot the 8th, the first day of my last period.. I had unprotective sex September 21, but used the pull out method,way early... I'm a week late on my period, but i didn't know if the depo is just messin with my period or should I take a test..I got on depo for my period, because I was passing out in pain. Didn't plan on having sex, but it happened... Advice??