Just Got an Email from 'Myself' Asking for Password Confirmation—Is This a Phishing Trick?

So this afternoon I received an email that appeared to come from my own email address, asking me to "confirm my password immediately" because they detected suspicious activity. The email looked pretty convincing - same signature, same email address, and even some of my usual phrases in the message. I’ve never seen anything like this before. I haven’t clicked any links or replied, but I’m worried if this means my email is already compromised or if it’s some kind of spoofing. I tried changing my password just in case, and ran a virus scan on my laptop, but all scans came back clean. Also checked recent login activity on my email provider and didn’t see any suspicious locations or devices. Has anyone else had an email that looks like it’s from themselves but is actually fake? How can I be sure my account is safe, and what steps should I take next? Is changing passwords enough, or should I do something more to protect myself from this kind of trick?