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http://www.americanpregnancy.org/pregnancyhealth/pregnancyswelling.html

When does swelling occur during pregnancy?

Swelling may be experienced at any point during pregnancy, but it tends to be noticed around the fifth month and can increase while you are in the third trimester. The following factors may also affect swelling:
Summertime heat
Standing for long periods of time
"Long" days of activity
Diet low in potassium
High level of caffeine consumption
High level of sodium intake

Slight swelling is expected during pregnancy; however, if you experience sudden swelling in your hands and your face, it could be a sign of preeclampsia. It is important to contact your health care provider about any sudden swelling.

What can you do to treat swelling during pregnancy?

Swelling may be reduced by eating foods that are high in potassium, such as bananas, and by avoiding caffeine. Here are some other helpful hints to manage swelling during your pregnancy:
Avoid standing for long periods
Minimize outdoor time when it is hot
Rest with your feet elevated
Wear comfortable shoes, avoiding high heels if possible
Wear supportive tights or stockings
Avoid clothes that are tight around your wrists or ankles
Rest or swim in a pool
Use cold compresses on swollen areas
Drink water, which helps flush the body and reduce water retention
Minimize sodium (salt) intake and avoid adding additional salt to meals