Pregnant ? (Repost)

The last time my boyfriend and I had unprotected sex was on May 24th, and had had unprotected sex a few days prior and the week before, meaning no withdrawal or anything. I was due for my depo from April 26 - May 21st, but didn't go back. I took an Elle (EC or plan B) pill on May 24th, and didn't bleed or haven't got my period nor any symptoms, is there a chance I may be pregnant ? 
Ps. my last period lasted 10 days, from May 7 - 17th, well what I thought was a period I didn't have a regular flow.