I believe my fertile week was September 20th-25th in which I had sex during that week. I experienced light spotting on October 6th which was two days before my period was supposedly due. I’m now 8 days late and receiving negative results. I’m experiencing all the pms symptoms but no period. As of recently I’ve noticed I’m getting headaches, dizziness and fatigue. To the point where I stand up all I want to do is lay back down. I’m not sure what’s going on because I keep getting negative test results. Has this happened to anyone? Did you do a blood test to confirm?