OPKs and BBT can help you to pinpoint the best timing for trying. Discharge can guide you as to when you O but it's not very reliable. Many people have clear discharge around O but also before AF.
Good luck!
Well get an ovulation kit for sure.....and discharge could be alot of things. GOOD LUCK and keep us posted on how you are doing!
I am sorry, for some reason the # of days blanked out. I know that on a 28day period, I usually start trying on cycle day 11, but not sure on a 21 day. Have you tried an ovulation predictor kit? Discharge can be a sign of pregnancy, or a sign of upcoming ovulation (amongst other things). Good luck in trying to conceive, I wish you well.