Let me start with the contractions problem. If the contractions do not increase in intensity, irregular, stops with change in position, then it is most probably Braxton-Hicks contractions. These are normal uterine contractions.

The leg cramps is normal due to pressure of the pregnant enlarged uterus on the nearby veins. This will lead to poor venous drainage. You may also have a lower limb oedema which is due to the same reason. The solution for it is to massage your leg muscles regularly and when sitting put your legs in a position so that your legs are higher than the level of your body.

Wish you a happy pregnancy