I believe she's singing about a pedophile and not a miscarriage. Also she's not singing about herself but a random person. She says at 0.55 girl, meaning she's not talking about a boy, but a girl so the girl is 13 and the guy, who shes singing about, is 35. At 2,34 she says for you i found a cell on the top floor of a prison just enough space to fit your feet in in other words ropes tied around her feet, before that she sings just enough space to put ur hands in (i know not exactly those words) meaning ropes around your hands. At 3.07 it says i'll come running with a heart on fire which means passion and guilt... that's just my opinion.