I used boots own to be honest as it's two for five pounds and then I bought first response. they are all the same accuracy level. For best results think.it's better going doctor to be honest.
I used first response 2 days after my period was missed and also used a dollar store test as well they both came up positive!..lol
I used clear blue 4 days before my period was due.. they all came out positive for me
I like clear blue...the one that reads pregnant or not pregnant. With all 3 pregnancys I found out using them. They are the best and worth that extra dollar!