Late and negative.....

Hello! AF was supposed to visit six days ago and was a no show. I've been taking an assortment of hpt and ALL were negative. I feel pregnant; sore breasts, fatigue, nausea, occasional headaches, and I've been having frequent, mild-moderate cramping for about two weeks. This would be baby 4 so I know what pregnancy feels like, I've just never had a problem with getting positive results! My husband thinks I've gone crazy and am making up the symptoms in my head lol!