Is zolpidem safe for pregnancy?

i take zolpidem for sleeping problems but there is a possibility i am pregnant and its the weekend so i kant go to the dr. is it possible that the zolpidem will affect the early development of my unborn baby?kan the pills affect the fetus or even me?it is possible that it kan cause a miscarriage ? normally i would just wait til i see my dr but i kant sleep without these pills at all ive been up for hours tryn to fall asleep without them so kan sumone please tell if its ok to take them?