You did not specify where you are. It would help others who try to answer you as each state has different practice.
What do you mean by 4 cancels? Cancel what?
Yes, in CA, both sides can do a 24 hours notice to cancel the contract. But you are probably not in CA or you do not have Realtor presentation, because your Realtor probably would not let that happen.
But, not knowing more than what you stated, I really can't say.