Kylie Kelce is providing heartbreaking details on her 2018 miscarriage ... revealing she learned the news on Jason 's birthday.

The Philadelphia Eagles legend's wife opened up on the tragic experience on her "Not Gonna Lie" podcast this week ... explaining she wanted to share her story in honor of October being Pregnancy and Infant Loss Awareness Month.

Kylie said right before her 12-week appointment, the couple decided to tell Ed and Donna about the baby on the way during a trip to London for Jason's game with the Eagles ... and went on to alert Travis and other family members.

But once she was back on U.S. soil and at her next appointment, Kylie said a nurse couldn't find a heartbeat ... and she knew what happened. Gallery Launch Gallery

"They estimated that the

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