My ob tells me that my uterus is measuring big for how far along i am with my pregnancy, is that bad?

Maybe: Sometimes being bigger is normal. For instance if you or your husband is above average height, then your baby may be above average for growth as well. Concerns come in when you might have diabetes or some other pregnancy complication that would make the growth abnormal. Speak with your doctor so you understand any risks that you/baby might have. Best wishes for pregnancy!