This is another “don’t worry” situation. Nearly half of all pregnant women experience some cramping or leg spasms during their pregnancy, especially in the second and third trimesters. They might be caused by weight gain, which can change how your muscles function and your circulation. Pressure from your growing babe might also cause your nerves and blood vessels to get all agro.  Here are some ways to reduce or treat leg cramps, and as usual, if anything is feeling extreme or beyond normal, contact your doc.