Hello M.. First of all, congrats on the pregnancy!!! I just wanted to let you know that I am pregnant (20 weeks now) with my third child and I was experiencing those same pains initially, to the point where every time I went to the bathroom, I just knew I was going to have evidence that I had started my period (even though I found out at 2 weeks that I was pregnant). I did have some minor bleeding, and headed straight to the ER (it was a first for me as my other pregnancies were a breeze, and nothing like this had happened before). Every thing turned out fine, but I was told the same thing, that the pain is caused from the stretching of the ligaments. I also learned that the baby naturally gravitates towards the right side of the uterus, so that was why I was experiencing the pain on my right side. If it is something that is really bothering you, go to the ER. You know your body better than anyone else. I don't know your situation, but I am hoping that it is nothing. Still, an eptopic pregnancy can be a nightmare, in all aspects, and you don't want to take that chance. Best of luck to you, and I hope that everything turns out ok. You'll have to keep us posted on how you are doing!!