Can someone tell me what this sounds like(women or doctors)?

i had my period about 3 weeks ago but about one week after i had sex i had this smell it smelled like waste(poop) i thought nothing of it really just my body having a weird malfunction then after that about a couple of days later it happened again but then i had brown blood so i thought okay maybe i need to douche so i did then after i did this week i had sex and the same thing happened..i dont know whats going on..i have to schedule a doc appointment tomorrow i might go to the er because i think douching cause a uti i always get those when i douche..but does anyone know what could be wrong with me?