Question about early access

[Ehr]

I got a key for early access logged on my account. I was looking at my square enix online store account and there was an option to cancel my pre-order.

Does that mean i can try the early access, decide Havensward is the devil and cancel my pre-order?

At this point all pre-orders for Heavensward have been charged should you have ordered from PSN or the SE online store. So no, you can cancel your pre-order but you won't get your money back.