Do not duplicate not working

For some reason I cannot understand do not duplicate is not working for me. Below is the code I am using. There are only two loops a query posts and the normal WP loop.

Any help much appreciated!

<?php $do_not_duplicate = array(); ?>

				<!-- Featured Posts -->
				<?php
				  	$my_query = new WP_Query('tag=sticky&posts_per_page=3');
				  	while ($my_query->have_posts()) : $my_query->the_post();
				  	$do_not_duplicate = $post->ID;
				?>

				<-- Outputs three posts here-->

				<?php endwhile; ?>

				<!-- Normal Loop -->
				<?php if (have_posts()) : while (have_posts()) : the_post();
				   	   if( $post->ID == $do_not_duplicate ) continue; ?>

				<-- Outputs the rest of the posts here-->

				<?php endwhile; endif; ?>

				<!-- But there are still duplicates? -->