Hmm I don't know - I've only ever used first response and tesco...
Def try again tomorrow if af not here. What cd are you on? Also if you didn't get your bfp til later on with dd then chances are you might just be a late implanter/slow hcg riser kind of girl
keeping everything crossed for you - maybe you will get a Christmas Day bfp, how fab would that be?!! Though I hope you get a bfp before then ;-)
Fwiw I also heard that afternoon urine can be better in some ladies.
Lots of luck! Keep us posted xx