I am having the same problem. I have been having cramps since 2 days after conception not hard cramps but mild. I was taking pain relievers and nothing happen that when I knew something was wrong. But I am 6 week about to be 7 and I still have cramps off and own. I asked the people around me and they tell me they never had cramps.... I don't know maybe we are one of the ones that are not so lucky but hopefully they go away. The cramps will last for about 15 secs and then I won't have another one until about 4 or 5 hours. Crazy sometime I wonder am I have already experiencing contractions but I know it is to early.