L.R.
Please don't say "I don't want to make something out of nothing"!
Mamas say that constantly on Mamapedia when posting with medical questions. Isn't it better to see the doctor and be told all is well than to say "I don't want to look silly; I don't want to see the doctor and be thought of as overreacting...."? Why not risk being told it's nothing -- for the sake of the baby?
This could be nothing. It could be something. My doctor ordered an ultrasound when all I did was pick up a box that was far heavier than I realized. She still wanted to check me out even though she said I likely was fine (and I was). Your doctor (if he or she is halfway decent) likely will want to check you out too. Yes, it's probably nothing. But we are not doctors here on Mamapedia. I'd at least call the doctor and ask about it.