Alright, so I did a factory reset on my phone a couple days ago. After the reset, all of my apps/music/photos were gone (as expected). But google play is missing to? I only have the original android market now. I've restarted (by turning off completely, and turning back on) my phone numerous times but I still get nothing. I do have the 'Google Play Services' app installed as well. After I reset my phone, I did sign in with an account different from the one I had signed in with when I got the phone. Could that be an issue? 
Please help ASAP!

Please help ASAP!