Hi gwtkse,
As I understand it, you would like to confirm if your Office 365 account has been hacked.
Currently, there is no an option that can be used for retrieving the audit logs for account login. For this situation, I suggest you refer to following actions to reduce the impact of this problem.
1. Configure a long, complex password for your account.
2. Change your password regularly.
3. Protect your environment with firewalls.
4. Keep your client computer with current versions of antivirus software, firewall software, and Windows security patches.
Thanks,
Maggie Li