Dee How are you? I had a another scan yesterday (not that I'm neurotic or anything!), and they said that the measurements are only accurate to within 5 days. I was 6+2 according to the scan last Thursday, and, 7+1 eight days later.
I've had 4 scans altogether, two private and two NHS and this is what I've been told:
Ist scan at around 5+0, NHS scan due to slight bleeding. Only 1 pregnancy sac, no yolk visible, unidentified object thought to be a possible cystic polyp. I questioned this, as it looked exactly like another preg sac to me, tho I'm no expert, and I was told it was possible, but very unlikely.
2nd scan. Private scan later that afternoon. I had been going to cancel it, but decided I wanted a second opinion about the second sac. Was told one definite preg sac, with excellent aura, well bedded in. Possible second preg sac, but sitting on top of lining, with no aura, and judged unlikely to grow.
3rd scan at around 6+0. Private scan. One pregnancy sac, good yolk sac, bean measuring 4.5mm putting me at 6+2. Other preg sac now gone, small amount of fluid where it had been.
4th scan at around 7+0. NHS follow up one. Two preg sacs visible. One with bean, well bedded in. Bean measuring 10mm putting me at 7+1. Other sac with visible yolk sac now grown, but no measurable bean, and sac still sitting on top of lining and not looking good.
So my conclusion is that the info we get in a scan is rather hit and miss, with a fair amount of inaccuracy! If doctors disagree so often, then so do sonographers! it's a pretty inexact science. I shall probably have one more private scan in a a little over a couple of weeks time, half way to my 12 week scan. I'm nervous that my poorly tiny invisible bean will come away, and bring the good bean with it, though I do realise that the info I will be given may in fact be random nonsense. I'm starting to trust my own judgement, and making my own mind up!
On another note. I am feeling fat, and am pissed off about it. It took me 7 hard weeks to lose my Christmas 5lbs flab, and it's back! I'm too tired to do my usual 5 mile walks, and am resting for an hour instead. If I allow myself to get beyond peckish, I start to feel sick, so am eating very regularly. I realise I should adjust my dinners to child size portions to compensate, but I like my dinner, and am shoveling it in regardless! I don't want my ex to know I'm pregnant till I'm 12 weeks, so have to suck tummy right in when we meet. Kids are keeping the secret well, bless them.