Swelling of hands an feet....

I'm 34 weeks 4 days pregnant and for the last couple days my hands and feet have been swelling on and off. they have swollen up before threw out my pregnancy an I don't have high blood pressure or any other signs of preaclamcia but I worry that it could be that. I do have a doctors appointment today at 3 as long as my doctor doesn't have to leave as she is on call. Just wondering if any moms had the swelling and ended up fine. Just worried is all