HOW TO BE SURE I AM PREGNANT ?

I took an early detection clear blue test on Sunday and got a Faint line. Took a clear blue digital + an early detection clear blue on Monday and got a faint line + 1-2 weeks pregnant .

I also did a boots test on all days and the boots one always came back negative .

I had some cramping yesterday and none today. I’ve been tired for the past few days .

I know I sound crazy , but how can I be sure I am definitely pregnant ?