Contractions..?

Deanna • Im a FTM to a baby girl born April 29 (after being told i could not have children) i plan to stay at home with her :) and im pro breastfeeding!
So i heard their hicks if they go away with walking but when i get up to walk i get a sharp pain in my pelvis that makes my knees buckle... they come and go arent unbareably painful but they are uncomfortable... its been going on for about 30-45 minutes and my belly is hard