Is it normal to have stretching/ cramping pains in early pregnancy? (I'm just over 6 weeks) I woke up in pain with…

Is it normal to have stretching/ cramping pains in early pregnancy? (I'm just over 6 weeks) I woke up in pain with cramps/ stretching at 1am this morning, it was so painful it made me feel sick, it eased after about 1/2 an hour . I checked that there was no blood. Has anyone else had this and everything be ok? Should I be worried? X