I just got my nose pierced yesterday, and my stud fell out today. I put it back in, but for some reason I can't put it in all the way. It won't go through the last part of my nose. When I feel the inside of my nose I feel a huge scab. Is my nose piercing closed? :(

If yes, do I have to go all the way back to the place or should I try to push it in to the other side?

OMG! It must hurt a lot! My opinion are don't put back anything just leave it nice and clean.

I would have pushed that sucker through, and just re-pierced it, like I've had to do with my ear piercings, but yes, the odds are very very high that it is closing back up.
Of course, if you've waited to long, you're just going to have to let it close again, and then go back some other time and get it re-pierced.