Tummy pains

Layne
I have been having PAIN in my lower tummy. I am 6 weeks and have been having it off and on for 2 weeks - at least once a day. The closest thing I can describe it as is similar to the pain when you have diarrhea. I don't have diarrhea but when I try to go, I do have a little gas. I asked my doctor and she said it is round ligament pain. It doesn't sound like it from what I'm reading though. The pain was so much yesterday that I actually threw up. Anyone else?