Period late. BFN. Still a chance?

My. Is late by a week. Been testing every two days since Aunt Flo was due. All big fat negatives. My husband is determined that I am pregnant as I am very moody bloated sick sore breasts and tired. I do not think that I'm pregnant have to wait 3 days before I can get to doctor's appointment for a blood test is there any one who's experienced this before? Where you pregnant? Or were your hormones just messed up?