no need to worry, ask your wift be happy.
i only start to have pet pet 痛 fm wk20, and 腰痛 fm around wk 24 , and now i am 28 /29 wks... but sometimes, when i rest more, i will not fell any 地方痛. it is good ar. Don't worry.
you can visit C+ doctor for ultransound if you still not 放心.