HPV shots

[misssockpuppet.livejournal.com]

So, I got my first two HPV shots within the last year and a half, and my old obgyn contacted me a few months ago about getting my final shot. I forgot about this until just a moment ago, and though "oh sh*t". So, does anyone know how late is too late for the 3rd shot? Can my primary care administer it or do I need to find someone at my new obgyn to do it? And also, will I need to go through a whole new course of shots if it's too late? Thank you!