I think you will be fine...as long as it has been diagnosed if it were to start dilating they can stop it by sewing the cervix shut till d-day..i watch tlc all the time and that seems to be the case. Dont worry!
every thing is going to be ok, from what I have read, a shortened cervix could cause preterm labor, but because they caught it they would be able to put you on bed rest and keep an eye on things, it will b ok