Preeclampsia?

Over the weekend I started having swelling in my feet and ankles. Like really noticable swelling. This is my third baby and I've never had more than just a little swelling for any of my pregnancies. I figured I just wasn't drinking enough water. Well, today my urine sample came back with traces of protein. It hasn't been reviewed by my doctor yet, and my blood pressure was fine. I didn't mention the swelling at my appointment because I didn't think it was a big deal, but now I'm concerned about the start of preeclampsia.