Difference between 'bump' and swell?

hlhindin

This may seem silly, but I've read a lot of posts about when we might start noticing the first signs of a 'bump' and it seems likely that won't happen for most people until between 14-20 weeks, especially first-timers.  I'm very thin and always have been, but I've noticed a definite swell in my lower abdomen in the past week.  Is there a difference between the elusive 'bump' that everyone is asking about a just a general thickening of the abdomen as my body adjusts to being pregnant?  Is that considered bloating?

 I'll be at 8 weeks tomorrow...I think.