Hey there...
I am only 14 weeks and I have been aching in my legs and back for some time now, especially after a hard day at work when I have been on my feet for awhile...
I think it is normal, I spoke to my gyn about it and he just laughed and said it will get worse before it gets better, but I will take achy legs and body for this little miracle inside me!!
Good luck and I hope you feel better