Eh sabar jap, since you're only 5 months postpartum dari C-section, lendir coklat macam tu boleh jadi normal je, mungkin masih ada sisa-sisa lochia or uterine lining yang keluar gradually, terutama kalau ada ketika activity or tertekan sikit. But honestly, I'd suggest you check with your gynae just to be sure, especially since it's been 5 months already, a few of my mum friends had similar concerns and their doctor cleared it up in minutes, so don't stress lah! Kalau ada cramping or bau yang strong, memang kena see the doctor faster.