Should I go to the ER?

Okay so this might seem kinda silly but ima still ask anyways. I am 40 weeks and I have a sharp pain in my lower leg almost to my ankle and i feel like my leg/foot is more swollen then normal, althought this whole pregnancy I have not had much swelling. When should swelling of the extremities be checked by a doctor? I dont want to go to the emergency room and have the nurses make me feel like an idiot again for going in when i dont need to...