6 weeks constant lower back ache

I’ll be 6 weeks tomorrow. I had a chemical pregnancy in 2018 and a miscarriage at 5.4 weeks in 2019. I’ve been having early pregnancy cramps, which from what I’ve read is normal. This morning I woke up and my uterus is aching, it just feels so sore and my lower back is aching too. It’s like a constant ache. I’ve read that it could be round ligament pain but then I’ve also read that it’s too early for round ligament pain right now. Is this normal? I’m so scared that it’s a bad sign that I’m going to end up miscarrying soon. 😭 Has anyone else experienced this around this time? I have a new OBGYN and I don’t want to annoy him before I even come in for my first appointment but if this is something I should call his office about, I will.