Quoting Lauraj Dennis:" I went to my MW about this and she said it is the baby sitting just on top of your cervix, so dont think ... [snip!] ... think there is anythink to worry about unless it is constunt but looks like a good sign baby is getting closer. good luck x"
But could also be where baby has settled in your pelvis area and could be moving and causing you to spasm. My midwife said the reason I'm feeling it is most likely because my little boy is 2/5ths and it's very tight when he moves etc!!