Thanks everyone for the answers. Here is what I found that I had to do.

router.events.subscribe((event: Event) => {
  console.log(event);
  if (event instanceof NavigationEnd ) {
    this.currentUrl = event.url;
  }
});

easiest way to find current path is either you directly use

this.router.url

or you can check current path on every router change using its events like this

this.router.events.subscribe((res) => { 
    console.log(this.router.url,"Current URL");
})

where router here is instance created in constructor like this

constructor(private router: Router){ ... }

constructor(private route:ActivatedRoute) {
  console.log(route);
}

or

constructor(private router:Router) {
  router.events.subscribe(...);
}