After you file

You did indeed make a mistake.   Even if your wedding was on December 31, you are required to file as married for 2025.    

You must wait for the original return to be fully processed before you amend.   Choose the most complicated return to use when you amend.  You cannot "pull" information from both of your incorrect "single" returns.   One of the spouse's information will all have to be entered again from scratch.

When you start the amended return, you will start in MY INFO.

 The first name  entered will be the “primary” taxpayer——and in subsequent years you need to keep the names in that order—do not try to change the order of the names.

When you enter the primary spouse’s information in My Info, you have to answer the question "Were you married?"  If you click the button for Married, then a drop down will appear that asks, "Do you want to file this return together with your spouse?"  Then you choose YES to file a joint return.  You enter your spouse's information into My Info.  Whenever you are entering income information there should then be a spot for you and for your spouse's income information.  WATCH for the names as you enter income on the screens.  Or when you click to add income it will prompt you to choose which spouse had the income.

When you prepare a joint return you include all the information for both spouses on the SAME tax return.  Include all of your personal information, all of your income from every source, all dependents (if any), all credits and deductions for both of you.  You get ONE refund with both names on it.

And…keep a record of how to access the “old” account for your spouse in case a need comes up to print it or find information from it.  TT will save it online for seven years,

Wait until your original return has been fully processed before you amend, and make sure you have saved a pdf of the original return before you amend. (If you do not save it as a pdf, the amended return will overwrite the original, and the original will be lost forever)

See this TurboTax support FAQ for amending a tax return -

CURRENT YEAR

https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/amend-federal-tax-return-curr...

Do not expect quick results from amending. It can take four months or more for the IRS to process an amended return.  

You can watch for information here:

https://www.irs.gov/filing/wheres-my-amended-return

Best Wishes!