I would call your OB/Gyn. I do not know how many weeks you are, because I guess I have not figured out exactly when Easter is LOL. I do not feel it is anything serious, but other than ligamnet pain, it can be one of three things: 1) You have a simple bladder infection which often feels as you are describing & is easily treated. Needs to be treated because bladder infections or UTIs can cause you to contract in pregnancy. 2) It could be that you are having some preterm labor. When having mild contractions they can be as you describe. It can also be a combination of these two. Bladder infections can cause PTL. 3) It could be something as simple as the baby is just getting better positioned. Making him/her flip to start getting ready for the birthday party. If you call your OB/Gyn in the AM they will just have you come in for an NST and see if you are contracting and grab a urine to test from you. So no panic that has to be done right this moment, but I would call in the morning.