cramps, pains and twinges will pretty much come and go throughout the whole 9 months as things grow and shift. i wouldn't see this as a cause for concern.
I believe they will come and go throughout the pregnancy... I had some twinging and pinching and a bit of AF type cramping for 2-3 days last week and now I have had none for 3 days...
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Re: cramping stopped at 7 weeks?
That was the same for me. My cramping was often coupled with constipation, too. (Sorry if TMI)
Both went away around the same time.