Pregpan, if the pain gets very strong and doesn't go away, you need to get it looked at (apparently upper abdo pain is the main symptom you get of bleeding behind the placenta). Which BTW doesn't sound at all like what you are describing. I"ve been having lots of crampy/stitchy feelings (come and go but are quite strong for a few seconds at least) along the sides of my abdo, I suspect it's one of those 'normal' pg things.