Is this your first baby? It could be the start of braxton hicks for you, I get period pains a lot and have done in the last 8 weeks or so... I guess as you are nearing the end of your pregnancy the baby is growing and everything is getting ready for the baby to come out so to speak so it could be just getting ready... monitor your baby's movements and if there are any concerns always just follow it up with your antenatal day unit or midwife, they would rather you were over cautious! xx