Lohan, 27, revealed that she suffered a miscarriage during the show, which caused cameras to stop rolling for two weeks.
“No one knows this, and we can finish after this. I had a miscarriage for those two weeks that I took off,” the actress said on the episode.
“It’s a very long story but that’s why on the show when it says, ‘She doesn’t want to come down, she doesn’t want to come down,’ I couldn’t move. I was sick. And mentally that messes with you.”
Lohan did not mention who the father was.
She adds: “Watching this series, I just know how I felt at that moment and I can relate to that girl, which sounds kind of crazy. I’m like, ‘Oh my god, this is really sad. Who’s helping her?’ No one knows what’s going on in my head at every second because I’m constantly thinking. My mind does not shut off.”
Lohan’s news comes off the heels of the Mean Girls star’s other big headline: her leaked list of past sex partners, which includes the likes of Zac Efron, Justin Timberlake and Adam Levine. (Lohan has since confirmed that the private list was part of a step at Betty Ford, and the information was never meant to leave the treatment center).