tested today, which makes me 4-5 weeks pregnant, I had a missed miscarriage in september, embryo was at 7-8 weeks. I am now scared stiff that the sme thing will happen. What can i do to try to prevent it? how can i set my mind at rest? Its going to be unbearable to wait 8 weeks for scan.I have 3 healthy children already and it was my first miscarriage, i'm 37.