Lohan dropped the bombshell during the final episode of the OWN show Sunday night ... when asked to reflect on her experience with the reality show.
"No one knows this," Lohan said ... "I had a miscarriage for those two weeks that I took off.”
She continued, "It's a very long story, but that's why on the show when it says she doesn't want to come down, I couldn't move, I was sick. Mentally, that messes with you."
Lindsay did not identify the FATHER of the child.
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