okay so my last period was on august 13 . The next one was due on September 9th and it never came. Today, October 6 i am due for my period again still not signs of it coming. I took like 12 hpt and all negative. today i also had a white liquid coming out my nipple when i squeezed. i have no other symptoms except 3 very bad headaches this week and one day of being extremely tired. my period has never been irregular and my bf and i have been having unprotected sex often so i am 60% sure i am pregnant but i keep getting negative test! is negative test 28 days late with my period common?