Extreme back pain?!

Over the past couple months I have been having some back pain picking my daughter up and putting her in her car seat or crib. The past couple weeks it has gotten so much worst! I went to a chiropractor and he told me the natural curve in my lower back straightened out and it’s probably due to pregnancy. Has anyone else ever heard of that?? I’m suppose to lay on a towel to help curve it back out but that’s making it so much worse! I go back on Thursday and I hope he can tell me something else to help the pain!