Hey,
I'm about 4 weeks along and cramping as well. As far as I've learned it's a normal part of implanting. I find it unnerving though - my first pregnancy and it's all so new.
I saw my Nurse practitioner for a consult before we were trying to conceive and she told me that every new thing will spark a question or concern :-) So I would try not too worry too much...as will I ;-)
I too had crazy, painful cramps from 3 1/2 to 5 wks, almost 2 weeks of cramping pain,I was nervous, but found out today at 5 wks 3 days that I have twins. No wonder, it was two implanting, twice the pain,I guess lol. So don't worry, the cramping is totally normal in the first 3 to 4 or 5 weeks
I am 5 weeks pregnant and up until a few days ago I was having bad cramps for 5 days straight. Scared the crap out of me, but then it stopped and i feel fine now. People kept telling me it was just my body changing in preperation for the baby.
The cramping is normal just signs that your uterus is changing in size. Now if its followed by bleeding then go see your doctor.. My cramps were like that too but as the days go on they lighten up. My doctor said it was all normal.