Wordpress: please help with get_posts()

Hello
I hope somebody will be able to help me, because on wordpress.org nobody replied

On my home page i want to display my latest 5 pages OR posts, with an exception of posts from category 3.

I use this code:

	<?php 
$postslist = get_posts('post_type&numberposts=5&offset=2');
 foreach ($postslist as $post) : setup_postdata($post);
?>  

<?php if (in_category('3')) continue; ?>

 <div id="posti">

<h2><a href="<?php the_permalink() ?>" rel="bookmark"><?php the_title(); ?></a></h2>  
 
<?php the_content_limit(150,'Več &rarr;'); ?>

 </div>

 <?php endforeach; ?> 

Code (markup):

But the problem is, when in the last 5 posts there is one from category 3, the code shows just 4 posts.
Do you have any idea how to do this, that it will always display 5 posts, no matter if there are any from category 3?

Thanks in advance for your time, Marin