Pregnant

How many of you ladies have had a successful pregnancy after having their first misscarriage? I’m pregnant but had a misscarriage 6 months ago and am 7-8 weeks pregnant. I’m just so scare :( I just barely found out am pregnant. I’m so happy but worry at the same time, as I don’t want to day dream about it and in the end something happens :( I’m having some light cramping on and off and my lower back does not hurt ,instead it feels tired but yet I still worry.