Lower back pain

Chloe
Hello! I am 4 weeks and 5 days pregnant (roughly) and I am experience lower back pain! I'm scared because in April I was pregnant and had this as well and I ended up having a miscarriage. I'm not sure if they are linked together or if the back pain is normal this early. I have a five year old and I don't remember any of this when I was pregnant with him. Anyone have any similar symptoms?