Last pregnancy, it never went away. And I made it to 14 weeks. I don't completely remember with dd, but it started back up pretty early too. So there wasn't much time with no cramps, for me at least.
I dont think it does until your uterus is done stretching to make room for baby, which will continue until baby stops growing. I still have mild cramps from time to time.
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Re: Cramping
BFP1: DD1 born April 2011 at 34w1d via unplanned c/s due to HELLP, DVT 1 week PP
BFP3: DD2 born Feb 2013 at 38w4d via unplanned RCS due to uterine dehiscence
I'm 10 weeks today and still cramping. Its just something I kinda got used to although I am not comfortable. Best of luck.