with DD i had very little symptoms until i was 7 weeks. the only symptoms i had were crazy mood swings (poor dh lol). bbs were never sore and m/s only kicked in (and then only vaguely) at around the 7 week mark and disappeared at 10 weeks...

i reckon pregnancy symptoms are so unique to each pregnancy, and what might be someone's sore bb's might be another persons tiredness; and being 5 weeks there is still plenty of time for stuff to kick in...

the cramping is a good sign and like beata mentioned is a sign that bubs is getting comfy and the uterus is growing...all positives and no doubt the other more 'preggy' symptoms will start to kick in now that bubba is settling in for the long haul.