i am 31 weeks plus 3 and past few weeks been having braxton hicks which are getting more and more i have a couple of hours where they are regular every 5 mins but then few hours where they arnt also low back ache on and off pressure on pubic bone loss of appatite feeling sick and the odd sharp pain in stomach but only now and then. is this normal or could it be prem labour. i have 2 other children but had none of this in the other pregnancies