Stevie Nicks has opened up about getting an abortion in 1979 and revealed that if she decided otherwise it would’ve “destroyed” Fleetwood Mac.The Rock and Roll Hall of Fame inductee — who was in an on-again, off-again relationship with Eagles singer Don Henley when she learned she was pregnant in the late ’70s — told CBS Sunday Mornings that she had no idea how big the band “was gonna get” at the time.“I got pregnant and it was like, ‘Why? I have an IUD, I am totally protected, I have a great gynaecologist  . How come this has happened? What the heck?’” Nicks told correspondent Tracy Smith.“So you took all the precautions?” Smith asked.“Yes. And I’m like, ‘This can’t be happening.’ Fleetwood Mac is three years in. And it’s big. And we’re going into our third album. It was like, ‘Oh no, no, no, no, no, no,’” Nicks replied.Nicks said it wouldn’t have gone over well with the band had she been expecting a child with Henley, mostly due to her breakup with guitarist Lindsey Buckin