Sex after baby ...

Okay so my fiancé and I have been talking babies for a while now and have set an estimated date when we would like to start TTC . I am the crazy over thinker and want to try and be prepared as much as possible I know stupid cause you can never be fully prepared 🤷🏼‍♀️. But I have a concern i know it will seem stupid to some which is why

I am posting anonymously but what is sex like after having a baby? Do you become looser ? Is it painful? Is it different ? I know it's dumb but my stupid self gets so scared that once we have a baby he wouldn't be attracted to me or I won't be good in bed anymore. An to those thinking we'll get a better man.. I have the best man and he has told me several times he doesn't care about stretch marks he doesn't care about any of it. He just loves me and wants me to be the mother to his children it's just my stupid self over thinking and genuinely asking