My labia is red and burns, i think i might be pregnant because i haven't gotten my period yet?

See a GYN MD: Both issues can be assessed and treated by a gyn md. A pregnancy test is the first step.

Yeast: It could be a yeast infection. If you think you are pregnant then take a home pregnancy test. Monostat creams are generally safe regardless of whether you are pregnant or not for treating a yeast infection. If sufficiently worried then it is best to make an appointment with your doc for an exam.