late and negative test

girls I am 12 days late with all negative test.

I was supposed to start period last month on the 24th. I was so excited me and my hubby went out and bought all different brands of test and all came back negative. I've never been so saddened in my life.

has anyone been this late or know what could be wrong with me. I would love to hear everyones input. I'm gonna give it till the middle of this week and I'm going to go see a doctor. just wood like to see if anyones been through the same.