The combination of being on your feet, hormonal & body changes plus even at 14 weeks the baby may just be "hitting" on a nerve is probably the cause.

Just try not to aggravate things, take it easy & get as much relaxation time in as you can - take a break whenever you can (even if it's only at home - every little bit helps & you won't get any breaks after the baby is born for the next god knows how many years!!

Those pains are really common in early pregnancy when the new pressures of amniotic fluid and expanding uterus touches many nerves (sciatic usually a problem and usually causes sharp pain across buttocks or down leg(s), sometimes causing your leg to "give out") we didn't know existed, and stretches ligaments. There are several articles at ivillage about pregnancy and exercise that may be helpful to you.

Remember though you will continute to get uncomfortable and big, and many different new things will become bothersome, ligament and early growth pain should end soon, and you will feel much better! If you are concerned and the pain worsens or becomes crampy or sharp for extended periods of time, call your doctor! Otherwise, get a good book, "what to expect. . ." is a very helpful series to have! Good luck!