I had period-type pains for ages before I finally decided to test and got a BFP. General pain and cramping continued til about 7 weeks and now I still have some abdominal pain and all sorts of odd twinges. Apparently this is completely normal but for some reason the pregnancy books often don't mention it. I really don't think it's cause for worry unless it's very strong pain accompanied by bleeding - if that happens, contact your doctor asap.