It wasn’t all that long ago that Britney Spears was dreaming of marrying her prince and starting a family. But now that she’s living her fairy tale, the eight-months-pregnate pop star is finding her life a bit more of a struggle. Although her doctor “keeps telling her she shouldn’t worry,” says a friend, Britney has been unnerved about her pregnancy ever since she made an emergency hospital visit when she was four months pregnate. At the time, she and her husband, Kevin Federline, were at their vacation home in Destin, Fla., when Britney, 23, began bleeding. Worried that she might be miscarrying, she and Kevin raced to a nearby emergency room. Britney spent two nights in the hospital until she was assured that all was well.