Mammychoo, I figured you might be Pram but wasn't sure if I was supposed to comment on it or not.
Block, I wouldn't worry too much about making sure you have a full bladder. I never have as I have had scans where I was so dehydrated that I didn't wee until hours later even though I was on a drip plus I am usually drinking as much as I can anyway. I've probably had a dozen scans over the course of a few pregnancies and the only time it caused any difficulty was last pregnancy when I had a low lying placenta and they couldn't see for sure whether it was clear of the os but they would have given me another scan later in pregnancy to check it anyway so it wasn't an issue. I don't think my letter for this scan said anything but the last one it said to drink a pint half an hour before the scan which made me laugh because at the time it was taking me from when I got up until lunch time to drink that amount.
Welcome Mrsksays, I am so jealous of you not knowing until 14 weeks - I knew about this one at just over three weeks because of my symptoms even though it was unexpected. (My excuse is that I hadn't had a period since DD2 and charting somehow failed - not sure how but according to my temperatures I never ovulated but clearly I did.)
Wrt how much nausea you have had, from what I have read it is only if you have no nausea and/or vomiting that there is supposed to be an increased risk of miscarriage rather than that the risk is in proportion to how much nausea and/or vomiting you have. I think the myth that the more sickness you have, the "safer" you are is very unhelpful as it causes a lot of needless worry to people like you with lower levels and it means that for those of us with hyperemesis gravidarum it is much more of a shock when it does go wrong because we are told that we are lower risk when we are not.
Pain, I can't remember if it was you who mentioned those kind of symptoms before or someone else but it is worth getting your haemoglobin levels checked as whilst pregnancy can cause those symptoms to some extent, anaemia can too so can make it much worse. I ended up with an amblance trip and a hospital admission due to mine in my last pregnancy.