Week 27 & cramps?

If there's one thing that i keep feeling this pregnancy, it is cramps... from early tri and now at week 27, there's always a dull ache & crampa that comes on and off. I am petite as well so does it mean it is normal? Do you mummies experience it too at around second and third tri? What can i do to make it better? Got a little anxious when there's such cramps.. Thanks all!#1stimemom #advicepls