Q about Depo Shot and risk of Pregnancy.

I got my "first" (missed correct time to renew) depo shot on Tuesday of last week. My period came the next day. I bleed until Friday and then it became spotty, so my boyfriend and I had sex. On Saturday he ejaculated inside of me. My period was gone by Sunday. (Background, my period has never been regular but my hormone levels are regular) I'm worried that I needed to wait 14 days since my last shot was expired, and I don't know that my period starting the day after technically counted as me getting the shot 5 days within my cycle...I know its early, so I haven't been experiencing any sort of early pregnancy symptoms, but I'm very anxious about it since it's too late to take plan B. I dont want an abortion but I'd have to get one if I was pregnant..Help? Any answers?? Maybe,,Could my doctors do a pregnancy test sensitive enough to know if I was pregnant now?