Hi ladies i am now 30 weeks and for the last couple of weeks my back has been killing me it is so achy. I have had a sore lower back most of my pregnancy but this is right across the middle of my back where my bra strap sits. I am guessing it is the weight of my boobs/belly that is hurting it but wondered whether anyone has the same thing and if you have any suggestions for helping it. I have tried a massage and also been fitted for good supportive maternity bras and still it is sore. It seems better at night but during the day i am in an office chair which really doesnt help it at all.

any suggestions would be appreciated