Extremely painful lower back pain . - 6 weeks today.

Pari

I am 6 weeks pregnant but I am suffering extremely painful back pain since morning. Is it any serious thing? Is it a sign of early miscarriage? This is my fourth pregnancy. First two was an ectopic. And with god’s blessings from last one I have a 15 months old toddler. 🙏 . But I never faced back pain. I can’t face anything miss happening. I already suffered a lot. I don’t know why negative things are coming in my mind. Please help.