Hi kelcqi,
I read this from somewhere, and it helps me alot! After I did the exercise, I didn't experience the cramp liao. *touch wood*
Quote from the book "What to expect when you're expecting"
Leg cramps
Between your racing mind and your bulging belly, you probably have enough trouble sleeping without having to suffer from leg cramps. Unfortunately, these painful spasms, which occur most often at night, are very common among pregnant women in the second and third trimesters. Fortunately, there are ways of both preventing and alleviating them. Because fatigue and fluid accumulation in the legs are thought to be possible contributing factors, wearing support hose during the day and alternating periods of rest (with feet up) with periods of physical activity may be helpful in eliminating or reducing the frequency of leg cramps. And be sure to get adequate fluids (at least eight glasses a day).
If you go get a cramp in your calf, straighten your leg and flex your ankle and toes slowly up toward your nose. This should soon lessen the pain. Doing this several times with each leg before retiring at night may even help ward off the cramps. If you feel the stretching in your calves, you are doing it right. Hold for ten seconds, relax for five seconds, and repeat two or three times.
Standing on cold surface sometimes works, too. If either technique reduces the pain, massage or local heat can then be used for added relief. If neither reduces it, don't massage your calves or apply heat. Do contact your practitioner if the pain continues, as there is a slight possibility that a blood clot may have developed in a vein, making medical treatment necessary.