First trimester back pain??

So I’m currently 8 weeks and yesterday I noticed how bad my back was hurting and as the day went on it just got worse and worse.. it got to the point that I could even bend over to pick something up without my eyes tearing up.. so my boyfriend told me to lay down and try to relax.. This morning I felt fine but I can feel the back pain slowly coming back.. I’ve never heard of anyone having horrible back pain during the first trimester. It’s not just my lower back btw, it hurts all the way up to my shoulders. I have a retroverted uterus but I’m not sure if that has anything to do with it.. obviously I know that the only person that can really help me is a doctor but I don’t go until this Thursday.. so I was just wondering if anyone else is experiencing this or has in the past? What can I do to ease the pain because by nighttime it’s absolutely HORRIBLE. 😥