i had this with our son's pregnancy, and decided that it must be him sucking on his fingers and pulling them out in a particular way after i saw and heard the same noise when he was on this side.
however, i recently read that the noise is amniotic fluid and the amniotic sac moving in a particular way.
so now i don't know what to believe.
none of the same noises thus far with this pregnancy.
~claudia