Could it be a yeast infection, std , or just regular discharge??

KKZ Family • 06/14 💕 07/1 💗
Well I just recently got off my period. I think August 4 until August 8 I was spotting August 9(my birthday) anyway here it is a week later and I notice my discharge is kinda yellow green brown. Well that's what it look like. I know thrich is greenish but mines kinda look like that but it look more like yellow when it dries up. Yesterday I had white sticky Strechy discharge. The smell idk it don't smell fishy like. I'm not itching or burning when peeing. And this just start happening Saturday after I had sex. I know I should know these things but I get confused sometimes so what do y'all think ?? P.s. No rude comments