A high school classmate and I were baptized on the same day. I happened to mention it and shared with her a copy of the church bulletin that mentioned our baptism. She didn’t have it.
Remember that others besides your family may have copies of materials related to your family history. County genealogy groups, both in the real world and online can be one way to with these people.
But your family aren’t the only people who may have personal papers that could help your research.