I am 12 weeks and 2 days pregnant and i find that sometimes when i get up too quickly i get slight pain in my lower abdomen. it only lasts a few seconds. should i be worried?

12 w pregnant ?'s: A "slight pain" abruptly when rising at 12 weeks of pregnancy may be due to the increasing weight of the pregnant uterus, with stretching of the ligaments which support the uterus. This will not continue, as when the uterus attains greater size, it will not be free to move forward or backward like a passenger in a car which accelerates or stops quickly.