Registering a copyright, trademark, or patent makes it easier for the holder of the registration to collect monetary damages if a case ever goes through a court system. It doesn't guarantee that the patent holder will win everything.

If you're not marketing a similar item or service to whatever company might allegedly object to your use of the domain name, buy the domain and proceed with the project. If you want to take additional precautions, you might want to buy a more specific domain name: WidgetsByAbbieRose.com, or something along those lines. That would go one additional step toward clearing up any potential market confusion.

There's acting in good faith, and there's acting in fear. Acting in fear is no way to conduct a life.