Hello Kathie,
Welcome to Apple Support Communities. We understand that you have some concerns about personal information possibly having been collected from your MacBook Pro.
Software installed from the App Store and identified developers would not pose a threat such as what you've mentioned. macOS has features that protect your Mac and personal information. However, malware which is a potential threat may be accidentally installed from other sources. You can learn more from Protect your Mac from malware.
If you suspect there may be an issue with malware, we recommend using malwarebytes to identify and remove it. Malwarebytes is a third-party trusted program that can scan for malware.
Take care.