The back pain
is probably just from the pregnancy, but the leg pain
you may need to watch out for. If the pain is in the calf, or in the thigh, the leg is swollen, or red, or hot, you need to let your OB know. Or, if it just continues to bother you even without the above symptoms, it would be best to just run it by the OB. You are at higher risk of a lower extremity blood clot, having twins. But don't worry too much; it is still very uncommon. Keep an eye on it.