What do I do now?

Mantha
My only depo shot was in December....i didn't have a period until May which turned out to be 2 periods. I have been having unprotected sex with my boyfriend. Now I think I'm late for my period I have not seen it yet. I only witnessed light bleeding on June 13. Not sure if it was spotting just remember it was hardly no blood on the pad. (Waste of Pad) right?