What are some tips for coping if I am embarrassed about my big belly?

Celebrate it. The big belly may be most embarrassing during the middle (2nd trimester) because it almost looks like you're simply gaining a lot of weight and so you become self-conscious. As you get to the last 2 months, it is so big that there is no mistaken that you're pregnant. Celebrate it! speaking of celebrate... Go google celebrity pregnant belly images and check out how they look.
You can try. Wearing loose fitting clothes, dark to black colors are slimming, and no stripes/plaids. To really address the problem, see your doctor to rule out any metabolic causes for your elevated weight and then follow their advice on proper diet and exercise.Shoot for 4-6 lb wt loss a month. Best of luck.