Risk of miscarriage at 5 weeks?

Orla
Hi all,
I'm 30 and 5 weeks pregnant with my first baby. I've been made to feel terrified that I'm going to have a miscarriage by everyone that I've confided in. Everybody is telling me that I can't relax until 12 weeks. The problem is that I can't sleep or enjoy the fact that I'm pregnant. I a check my pants for blood every half an hour.
At 5 weeks do I still have a 25% chance of loosing this baby? Where I live you don't get a scan until you are 22weeks. I really think I will lose my mind before then...
I'd love to hear any wisdom and experience on this matter. Thanks