TMI » Is it a yeast infection?

 I'm fourteen & have just recently ended my period. 
My period lasts about 6 days max. Throughout those days it had been so hot that I couldn't get up to shower, but I did use warm water to wipe down there very well. 
I'm not really sure what it is or if it could just be the heat making down there feel icky if you will.
There is a funky smell coming from down there. When I wash in the shower, it goes away for a few hours & then comes back. There is no itch or burning. I went to the restroom & noticed something yellow & sticky in my underwear,  I'm very familiar with discharge, but it has [never] been yellow.