During pregnancy, the body produces approximately 50% more blood and body fluids to meet the needs of the developing baby. Swelling is a normal part of pregnancy that is caused by this additional blood and fluid.

Normal swelling, which is also called edema, is experienced in the hands, face, legs, ankles, and feet.
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. yellow color wear for mother of the bride

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.

Source:
Mayo Clinic Guide To A Healthy Pregnancy Harms, Roger W., M.D., et al, Part 3. Pregnancy, Childbirth and the Newborn: The Complete Guide. Simkin, Penny, P.T., et al, Ch. 6.