yeah thats totally normal on sat u could have been exactly 2 weeks and today you could be 2w+6 so it would still say 2-3w. My clear blue said 2-3weeks on 31/12/11 and I would have been 3w+6 so only 1w+6 from conception.
CB Digi go by your HCG levels...
3 weeks LMP: 5 - 50 mIU/ml (not pg/preg 1-2 on cb digi)
4 weeks LMP: 5 - 426 mIU/m (preg 1-2 on cb digi)
5 weeks LMP: 18 - 7,340 mIU/ml (preg 1-2/preg 3+ on cb digi)
6 weeks LMP: 1,080 - 56,500 mIU/ml (preg 3+ on cb digi)
7 - 8 weeks LMP: 7, 650 - 229,000 mIU/ml
9 - 12 weeks LMP: 25,700 - 288,000 mIU/ml
13 - 16 weeks LMP: 13,300 - 254,000 mIU/ml
17 - 24 weeks LMP: 4,060 - 165,400 mIU/ml
25 - 40 weeks LMP: 3,640 - 117,000 mIU/ml
but this is only an estimate, they are not exact fihgures and you can see there is alot of over lap.
