Cramps at 28 weeks

Helen • Happy family with 8 year old 6 year old and 4 year old 🙂
I am currently 28 weeks and 1 days and for the past few weeks I have been having period like cramps in my lower abdomen they only last a minute or so but they are sharp. I have told my midwife and she thinks it's ligaments stretching. Has anyone else had this pain at 28 weeks ???