need some advice for other moms

Okay I need some advice from other moms out there. I'm a first time mom and yesterday while out shopping with my husband and his parents I got this really nasty pain in my left side basically above the hip just below the ribs and almost into my back. It stays there for a half hour to an hour and slowly went away and only came back a little bit. However when we got home I told my husband while he played a game that I was gunna go lay down. So I had a heating pad on it laying on the couch with my back to on it so no, it wasn't on my abdomen at all in any way, and tried to get some rest. It didn't help at all and it only ended up coming back. I have had endometriosis in the past and have a high tolerance for pain and always have yet this pain wouldn't let me sleep at all and what little shut eye I did get I was tossing and turning unable to get comfortable. I woke up this morning to that area in so much pain that it hurts to walk. It's not going away at all and the only thing my doctors office recommends is getting checked out at labor and delivery and see what they say. But she didn't say that I had to go. Before I make a choice has anyone else had this problem before and knew what ended up happening?  Yes, I do still feel my baby move as well so I do know he is doing okay right now. I just don't know if I should be worried enough for a hospital visit or not. And also, as of today I'm at 34 weeks and 3 days.