I am in my 36th week and have had that pain you describe since about the 16th week. I went to the dr back then because it was so bad it was difficult to get in and out of bed, put clothes on, etc...what they told me was that it was so engorged and it was just going to be like that for the pregnancy. But I was assured that it was normal (not everyone gets it, but it does happen). I swear sometimes it felt like someone kicked me down there!!!! Thankfully, I had a few weeks of relief from it here and there (well it was always painful, but it lessened at times). Now I am at the end of the pregnancy and it is much worse from the baby bearing down. Just hang in there, you do get used to it after a while....Good luck!