There are a number of common physical changes that start to occur in the second trimester of your pregnancy. They might include swelling of feet and ankles, tender gums, nasal congestion, heartburn, back pain, and sore legs. Many of these feelings are a natural, expected part of your pregnancy, but there may be ways to cope with or ease the discomfort. See the links below for suggestions on how to best deal with such aches and pains.