I'm currently 27+4 and this week I've been having pain in my lower and middle back, especially after workdays (I do a desk job). I also have been having some aching in my lower abdomen. I've sort of been assuming that this is normal, as things grow and I spend all my days in a seated position. However, NHS website identifies back pain in second trimester as a possible sign of early labour. Does it have to be accompanied with other symptoms to be a cause for concern? Have others experienced backpain at this stage?