I'm TTC for 4 months now, my last af was October 12. I had unprotected sex on October 25 and ovulation was October 26. I'm supposed to be getting af on November 9th and still have no signs of her. I'm 19dpo and all tests are still negative. I have had yellow discharge eggy look to it only one time. Any chance that I could still be pregnant and the tests are false?