pregnant? normal? something else?

Kelsey

I had my 3rd child 1.3, a tubal ligation 1.4, and my first pp period 2.16. I've had off and on spotting for a month now, and am 24 days late. I took 2 pregnancy tests, but both were negative. I'm making a dr appt just because something feels off, but not sure if I am being paranoid or if I have a valid concern. My husband keeps blowing it off any time I ask him.