I have a bunch of different kind of tetras, and i just noticed that one of my neon tetras is looking a little... round.

I would try to get some pictures, but my camera is dead....
Is there any other signs of pregnancy that i can maybe look for?

It isn't common for a tetra to spawn in an aquarium but it is possible. If it starts to strugle try feeding small pieces of krill to it in case it's stopped up and it acts as a laxative to them.