Has anyone done this?? What were the results??

I have heard that you can use them earlier then a HPT and if there is a second line that means you have HCG in your system. I'm 10DPO and thinking I might give it a go as I'm worried I'm having another ectopic pregancy and for the first time in my life I'm hoping the bleeding (spotting) I'm having is the start of AF.

Thanks.