I'm almost 13 weeks, is it too soon to start swelling? My blood pressure is good and I've already…

I'm almost 13 weeks, is it too soon to start swelling? My blood pressure is good and I've already passed 1st glucose test. At my appointment last week my doctor asked if I had any swelling and I said no cause I hadn't up until that point. Now it seems like my ankles sweet everyday since. I try to drink lots of water and I haven't gained any weight. Any ideas??