Can someone please help me?

Hi, I'm 18 years old and I got off of depo provera on January 26th and I got my period on February 20th and it lasted until February 27th.. A week after I got off of my period I had unprotected sex with my boyfriend, he came inside of me 3 times.... Now 4 days later I have light spotting. What are the chances that i can get/be pregnant? Please help.