Hi,
Headaches or discharge fall among the many symptoms that are common with early preg, or PMS. It could even be totally unrelated. The best way to find out would be to take a home preg test or a blood test (which is even better than a home preg test that tests the amount of a certain hormone in our urine), around 1 week after you miss your periods. A lot of home preg test kits are also very sensitive maybe even a couple of days before your period is due and definitely a few days after, but I'd wait a week to do the test just to be doubly sure.
For me, I never had ANY discharge as early preg symptoms; in fact, for me any sort of bleeding or spotting would've been abnormal if pregnant and would certainly mean my period is about to start or starting.
Hope this helps and hope you get your positive test soon!