Replying to Someone hacked my gmail account

i came across this random site (justanswers.law) and started to make an account using my "backup" email account on gmail. The site says that "someone already has used this email", so i'm like thats wierd, i click the button that sends a new password to my email and check it. someone actually did make an account there, using my email, and somehow they knew my last name and my moms last name because the username was a mix of both. should i do something about this?