Please advice. pregnant and have a huge fibroid.?

i am 14 weeks pregnant and i ve got a big fibroid (10 cm accross), on the outside of my uterus. the baby is fine for now. my doc says the fibroid could cause misacrriage.
now as much as i hate to think of such a possibility, it would be helpful to know if certain foods or herbs such as pomegranate can prevent miscarriage..
if i take less salty and spicy food will it stop the growth of the fibroid to some extent ?
and i ve been told to undergo a blood test that checks for down syndrome. is this test given to all carrying women or does fibroids have anything to do with down's syndrome ?
also beacuse of the fibroid, i ve had to undergo an ultrasound already and once more because my doc could not hear the baby with the doppler. and i am having one more next month. thats 3 times already. is this good for the baby ?
i am 28 years old and my husband is 32.
thanks for any help.

congrats on your baby i'm pregnant as well my mum had three fibroids and just had a baby 3 weeks ago she was very healthy the obvious thing to do is no heavy lifting and avoid sex until your at least 20 weeks to be on the safe side downs test are routine and the fibroid is not a contributing fact but its your choice whether or not you would like to know ultra sound totally safe it always nice to see your bundle of joy
good luck

Congratulations on your pregnancy! Ultrasounds don't harm the unborn child.
All pregnant women are asked to undergo the test for down syndrome. This has nothing to do with the fibroid.
Good Luck!