dear patient , there are many reasons of leg pain during pregnancy like stress , big uterus size compressing nerves and blood vessels around it ,edema , weight gain etc. there is no need to worry as this is a very common problem in pregnancy . to reduce this pain you should avoid standing or sitting in one position for long time , take a calf massage with warm water , take a walk everyday unless ur doctor has advised against it due to some medical condition. feel free to contact us anytime.