My platy has a massive black dot shall i put her in the breeding trap ??

Answers:
if you keep asking the same question, you wont get diffrent answers

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This may indiacte that she is going to give birth soon, Alo you should look out for birthign signs (Hiding, Swiming fast etc,) I strongley suggest you do not put the female in a breeding box//trap. As it resulsts in dead babies and on some occasions a dead mother (it is very common) , I suggest you just leave her in the tank and provide floating and bottom plants (fake or real) Then net the babies up and put them in the box, But its up to yourself what you do, Put yourself in the fish'es position.
~ GG

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If the black spot on her tummy she could be having babies in which case YES.

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if she has already a squarely look about her yes
the gestation period for livebearers is 28 days
also read through the following article
http://fishlesscycling.com/articles/bree...

Hope that helps
Good luck

EB