Backaches... newly pregnant

Who freaks out with lower back pain/aches that last a good while? I’m just a little anxious since it’s been going on for at least an hour or more now. But of course I am working and up and down a lot. It’s just never been consistently aching like this. I’m a little over 6 weeks and history of MC/chemicals. Ultrasound 2 days ago looked good but stress is getting the best of me I guess.