pregnancy after depo

Kaitlyn
So I'm not sure if I'm pregnant yet, going to the doctor Tuesday... I'm only 16, I was on depo but I had missed my shot.... I know there is a 2 week window so I didn't even think I was pregnant but my friends have had me a little worried lately, just because they keep pointing out little symptoms I didn't notice... i missed my shot on the 14, and had sex the 19th. 
Which is still between the 2 week window... I'm just curious if anyone has gotten pregnant from depo like that quick or if it's just paranoia...