Round ligament or Braxton hicks?

We were almost in a fender bender earlier and ever since I've had tight, knot like pains in the areas just above the front of my hips but more so under my belly. If I sit down or stop moving they seem to stop. Movement especially walking makes them twist up in knots. Its now 2 hours later and still off and on.No blood or Spotting at all. Almost 16wks