Kristen Stewart can’t wait to become a mother with fiancée Dylan Meyer – but admits she is “scared” of childbirth. The 33-year-old former ‘Twilight’ star and her 36-year-old screenwriter and actress partner – whom she got engaged to in 2021 – are starting “preparations for how they might go about getting pregnant.” The couple, according to Rolling Stone, have “discussed the possibility of carrying each other’s embryos.” Of the couple’s baby plans, Kristen told the magazine: “I don’t know what my family’s going to look like, but there’s no way that I don’t start acquiring kids. And also, ideall…