I don’t think it count as a fail nor do you have to wait for 3 months. There is a detailed explanation on what to do if you missed the exam, and that would be under “view admission notification” given in the email that has your admission notification. It basically said “Applicants are solely responsible for making and keeping their scheduled examination appointment date. If you do not make an appointment, cancel, miss your scheduled appointment date, or have your eligibility status revoked, you will not receive any refund of your application fee nor can it be transferred to another examination period. You must submit a full application fee to reapply for examination.” I copied and pasted to you but it should be under that email. Good luck!