should i go to emergency room?

so friday i started having some right, under my breast rib pain. it didnt bother me at first it just kinda was there..then friday night it was realy bothering me to the point where it hurt to sit. i fell asleep and thought it might just be gas? so i woke up saturday with the pain again, i went grocery shopping and it was hard to concentrate because the pain hurt pretty bad. it wasn't as bad to the point where i cried but getting in and out of the car was painful. now i came home and did my normal business and it was hurting, including my lower abdomen. now its sunday, currently 2:50 am and i have pain. the same pain...should i be concerned? anyone else have the same experience? im not crying of pain...but it is hurting. im also 35 weeks pregnant today exact.