Pro and cons of cervix checking: should I

I'm confused. Is it safe and healthy and reliable to check your own cervix? 
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Pro's i've heard
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Easy to tell if preg or not
Tell where you are in cycle
It closes and hardens within hours/days of "o" and no more then that. 
Cm follows a patern. 
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Con's 
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Doesn't really tell you much/unreliable 
Unsafe (causes infection, messes up fluids, etc)
Causes damage
Dries you out
Some drs tell you not too. 

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