How Can I Tell The Diference Male/female Platy?

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hmm i have looked at some pics but cant tell, i have 4 and i thought 2 were pregnant but now i think they are males hmmm

 

[dmarie04]

Check the anal fins. Underneath the fish towards the tail. If the fin is fan shaped, it's a femal. If it is tubular, it's a guy!
This link has a pretty good pic for reference:
http/www.fishforums.net/index.php?showtopic=46309

 

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ahh thanks

 

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oh no i think they are all boys, wil i be able to put a few females in (my tank is 28 uk litres) not a large tank but we will be getting a much bigger one when we move, they are fighting quite a lot