For such a common problem I hope someone has good advice for some relief!

I’m 24weeks and have nagging back pain when sitting or laying down. Walking is better, but I work a computer job where I have to sit and obviously I have to lay down to sleep. It’s not unbearable yet but only being 24 weeks I’m a little concerned at how bad it will get by the time I’m 35 weeks! I already wear a maternity support belt. Heating pad helps some. Not big on pain meds unless I really need them. Anyone have any other suggestions that worked for them?