If it's something you're really worried about go and see your doctor to try and ease your mind. During the first 3 months with this pg I suffered cramps, some of them got so bad I had to breathe through them and did worry me a great deal, but as I didn't get any other symptoms I tried not to worry too much about it (easier said than done, I know). I think everyone is different and our bodies are different, some people may not suffer cramps as such. I do remember when I was pg with my first daughter during the first few weeks after I missed AF, I had that feeling like my AF, pain in my lower abdomen was going to arrive any day but it didn't happen.

I hope everything is ok and you have a H & H pregnancy.