In Beyoncs new Netflix documentary, Homecoming, the singer opens up for the first time about her extremely difficult pregnancy with twins Sir and Rumi.

I was supposed to do Coachella the year prior, but I got pregnant unexpectedly, Beyonc said in the film. The development led her to postpone her headlining spot at the festival for a year. And it ended up being twins, which was even more of a surprise.

Beyonc said she developed preeclampsia , a high-risk condition that includes high blood pressure and sometimes damage to certain organs , like the kidneys and liver, according to the Mayo Clinic. She also had a scary delivery.