Hi

Have had those sharp pains too - kinda like a stitch - and takes breath away.
But from what I've read believe that it is the ligaments stretching.

Think the particular ligaments being effected are called the round ligaments which are of course now taking up a growing weight each day. I've got them when walking or if I move quickly or sneeze/cough.

Mentioned it to a few friends who've had babies and they agreed that this is what it is/was. Don't think it is something to be concerned about unless was non stop.