yeast infection ???

help!! this is kinda tmi but i'm just a lil worried. so i'm not quite sure if i have a yeast infection or not or if it's something else. when i woke up this morning i could feel that there was a sort of burning and itching sensation down there... i eventually got up to check and look to see what was going on and there was some white stuff? and like it was like a light brown and some white? i don't know what it could be because i've never had a yeast infection but from what i've looked up i feel like it could be that, plus i just got off my monthly and usually i have whiteish discharge but it just seems different. also, i just got off taking some prescribed antibiotics a few days ago because i was sick, and i guess that could be contributing to what's happening? i would go to the doctor but i just don't have the money to or the time. is it a yeast infection though?