Should I be worried? (6w2d)

April • I`m 29 years old (30 in March), my husband is 38, and we have been actively trying to conceive since September 2012.
I woke up this morning with very mild, consistent cramping. No bleeding, but so far the only cramping I've had has been mild and intermittent. 
Should I be worried the my cramping is consistent? The pain is very very mild, but I thought it's supposed to come and go...?
Also, my stomach is kind of tender to the touch, which is also new. 
Is any of this normal?