Thanks Abab and everyone - you are right of course, there is nothing to be done except wait and see. It's made worse I think by being off work with a stinker of a cold, and not much to do but sit about.
Feeling better though after reading your replies, and getting on with some crochet :)
Have heard from midwife at epac - I'm booked in for a scan on Monday, although I have to day she didn't sound very hopeful. But now it's booked I feel more able to let go, as I know there is nothing else to do.
Cloudjumper, I hope your cold is better soon too - if its the one going round our way, it's awful!!
Bottle, I meant to say, and out may not be much comfort given what's happening with me right now, but I never get a decent positive straight away. Never before I am due on and then very faint - at least a good week before its a nice dark line. Also this time I got two positives from day of period, then on the third day nothing. The next day it was nice and dark... So I think it was a dodgy test - it's possible! Tests done at night especially unlikely to show a strong result early on...
Having said all that, not sure how far along you are - I'm wishing you the best of luck though, and hoping ask is well for you xx