yep, I am using First Response. I was just looking through my diaries of my last pregnancy and I didn't test positive until 20 day post AF and got a positive then, which was pretty much when AF was due anyway....three days previous to that test I tested neg, is that a pattern I should be looking at?
FR seemed to be incompatible with my wee. Even when it turned out I was 2 weeks UTD I got 3 BFN off first response. I'd wait till at least the day before AF is due and use first morning urine. I know other people swear by FR but not me

HTH!