Danica Patrick: I Froze My Eggs Way Before Aaron Rodgers

Danica Patrick says she's taken out an "insurance policy" on her biological clock ... putting her eggs on ice to guarantee herself a shot at motherhood.

"A couple years ago, I did an (in vitro fertilization) treatment to freeze my eggs because I'm getting older and I drive race cars," Danica said on "The Joe Rogan Experience" podcast.

FYI, Patrick is 35 ... and plans to retire from racing after the Indy 500 in May.

But Danica didn't wanna take any chances while her career was still full throttle ... so she made the choice to extract a couple dozen mini-Danicas during her relationship with Ricky Stenhouse Jr.

She says the treatment sucked -- but was ultimately successful.