If you are filing a joint return with your spouse, then you probably did not exceed your standard deduction until you started entering your charitable contributions. The standard deduction for Married Filing Joint is $24,000 for 2018, which would be close to the amount that you said you had entered for mortgage interest and state and local taxes.
To be sure that you are getting the best possible deduction for your tax return and filing status, see the instructions in the TurboTax article below or take a look at your Form 1040 on line 8 (the standard deduction amount is shown right there on the form).
https://ttlc.intuit.com/replies/3300919
Note: For 2019, the standard or itemized deduction is shown on Form 1040 line 9.
[edited 3/27/2020 | 11:38 am PST]
