Boots Own vs FRERs

DOL

Hi all. Am I right I’m thinking that Boots tests take more HCG to detect a line than FRERs? I ran out of the FRER 6 Days Early tests and took a Boots one but the line is lighter than it was on the FRERs. I’m 15DPO today and my period is due but hasn’t arrived yet and I hope it does not!