Hi! "normal discharge" as in you have your period, or it's clear cervical mucus?
If your periods are normally 30 days, then you would typically ovulate around cd16 or so. Ovulation typically occurs 2 weeks before your period is due!!! It can come with cramping, sore bb's and often an "egg-white" mucus discharge.
I would suggest taking and recording your basal temp every morning (taken at the same time each morning, when you first wake up!), this will help you to learn when you are ovulating!!!!
If it's not an early period, then I would wait a few days and try taking a home preg. Test. Buy one that has a high sensitivity to the hcg hormone and take it first thing in the morning, when your urine has a higher concentration of the hcg. (first response, clear blue easy...Good ones to buy!)
if you get a bfn (negative), then I would wait until after you have missed your af (maybe the 27th or so) and try taking another test!!!!
Hope this all helps?! If you have any more questions or concerns, I will do my best to help you
good luck!