The popstar appeared during Saturday's SHEIN Together livestream event, where she performed a handful of songs before opening up about having a bun in the oven.
She revealed that while she had "good days," other days weren't so good.
"I cry when I look down at my toes or I cry when just doing simple tasks," Perry confessed.
"I think a lot of that is hormonal and I'm not used to being around so many people all in a confined [or] a small space for so long," she said. "I'm used to going [out] all the time."
Although she's used to having some "alone time," the "Never Really Over" singer said she's found a way to escape without leaving her home.
"There is not really anywhere to go besides my car," Perry said. "So, I go to my car a lot. That is my safe space."
The singer also offered a Mother's Day wish to all the mothers out there, expressing excitement in becoming one herself.
"Hey everyone out there, it's Katy Perry," she said. "I want to wish all the mothers a Happy Mother's Day and I am so excited... and, I think, ready to join your club. I hope you are doing well and staying safe."