Slow fetal heartrate and slow fetal growth feeling upset and confused

[reallygrumpy]

I'm something like 7 or 8 weeks pg and had a second dating scan today because the hospital wanted to work out my dates precisely. There hasn't been as much growth as there should have been comparing this week's scan with last week's and the fetal heartrate was slow (it was fine last week). I had some slight bleeding over the weekend too. I've got to go back next week for another scan and I'm finding this so difficult, I'm terrified that I'm either about to have a miscarriage or that the fetus will die and I won't know. I don't know how I'm going to stay sane till next monday, I've been vile to DH and I'm being a crap mother to DD. It's taken 18 months and fertility drugs to get to this point. I'd really welcome any advice. Thanks