There would be many reasons suggested for cramps as you're pregnant, such as changes in your metabolism, having a vitamin deficiency, being not or too active. However, there's no particular reason so as to why they o cur in pregnancy.

How can I get rid of cramps?

To calm your leg cramps, you can try these:

• Stretch your muscles by pulling your toes hard up towards the front of the ankle

• Rubbing the muscles firmly

• Walk around

• Heat pack

If you're partner is close to you, you can ask them to help you.

Things that you could try whixh can help in preventing cramps ehich includes:

• Giving a strech to your calf muscles before you go to bed.

• Drink plenty of water

• Give yourself a warm bath before you go to bed

• Have a balanced diet

• Avoid stretching your leg while pointing your toes

Magnesium, calcium, vitamin B and vitamin C are suggested as a treatment for cramps. Its not clear that if any of these supplements would work, but people quite often try magnesium and calcium.

Source: https://www.pregnancybirthbaby.org.au/leg-cramps-during-pregnancy