Should I be worried?

Michelle

So I went and took a shower this morning everything fine. I went and laid down on my bed (well to air out😳)and when I got up my back was hurting like alot....I then went to the store walked a bit and got home laid down and that when the pain would go away come dinner time by back was hurting so bad I could feel a shooting pain every time I walk...its not my lower back but on my left side middle back...im 19 weeks pregnant there's no other symptoms I've been able to feel baby kick today and put pressure on my belly( been feeling movement since week 12)....there's no bleeding or anything so I'm wondering if I strained my back just by laying down wrong or something? And just wondering if I should be worried about the baby. Thinking about sleeping on the couch only because the couch is the best back support for me to stay on my left side most times and figured the more moving pillows around right now to be comfy would not be such a good idea bc the more I move right now the more pain in that one spot in my back.