I just took a test yesterday, and it came back positive for being pregnant

I just took a test yesterday, and it came back positive for being pregnant. I'm terrified! I've had three miscarriages over the passed three years. now finding out that I'm pregnant again, I'm terrified that this will be my fourth. I'm feeling slight cramping but no bleeding. I'm seeing a doctor next week to see what can be done to help this work. keep me in your prayers.