kawazuki - yes all 3 tests I've done were from the same box. The first I did 1 day before AF was due and BFN (not sure why I tested then, I knew it wouldn't be pos cause it was too early...). The second was the one with the 'mark' in it and the 3rd was the BFN yesterday.

Cassius2 - I went with first response this time as last time I got my first BFP with a pregnosis (after waiting 7ish mins for it to come up) and then tested later that afternoon with a FR and had a BFP show up almost before I put it down...

Alan - Thanks for your advice. I might leave it until next weekend and if AF still hasn't shown test again. Just a question for you (I see you are a midwife), I had a very early miscarriage last cycle (it was 'dated' about 6 weeks but I believe it was closer to 5). Do you believe my cycle could therefore just be messed up this time?