Filter list items created by ME - SharePoint Online

Hi there,

I'm trying to retrieve data from a list where the items are created by ME

This is what I'm using but it doesn't seem to be working.

var userName = _spPageContextInfo.userDisplayName;

var url="/_api/Web/Lists/GetByTitle('My Links')/Items?$top=3&$filter=Author eq "+userName;

I also tried using user Id

var userId = _spPageContextInfo.userId;

var url="/_api/Web/Lists/GetByTitle('My Links')/Items?$top=3&$filter=CreatedById eq "+userId;

Any help will be greatly appreciated.

Many Thanks