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Yes and no, depending on the circumstances. It just may be that your uterus is growing and pelvis is spreading. I wouldn't really worry unless it continued. If after 24 (consecutive) hrs it's still very painful, I'd go to the Doctor's.
Most the time it is usual, I'm actually 8 weeks and having the same. The only time I would suggest rushing to the dr is if you are bleeding as well.
I was told by a nurse from my ob office that it could also be that your body is getting use to not having a period I am 10 weeks and I've had the same pain and Im fine but if you start to bleed or get back pains I would got to your dr office.