Husband think I am

My husband thinks I'm pregnant. I am 11 days late. Took a hpt 3 days ago and it was negative. 11 days is the latest I have been late, so I'm confused. Lately, I've been cramping on and off, sick, gassy, no appetite really, and headaches. I don't really think I am. I'm suppose to be taking pain pills and antibiotics for a broken tooth and posible abscess but scared to take them if I am and tested too early.