I've had them since 3.5 weeks. They got kind of bad between 4-6 weeks, and I was super worried I was having an ectopic pregnancy. Turned out baby was in the right place, and was told all was normal. They got a bit better, but were still pretty regular. I'm still having them now at 10.5 weeks, and doctors and friends assure me it's normal! (although they still have me worried!) a doc and nurse told me it was b/c my uterus has never been this big before...