Even on day 21 No PMO (and my reboot Last year) there are thoughts and kind of desire for Orgasm. I know, to give in leeds to nothing, so I am happy to read in this Forum to avoid habits of Masturbation and staying on track. But it is day to day fight. My good luck is that I am able to resist looking Porn.
Keep going avoiding P*, urges will never stop coming but they will become weaker as the time pass. Try to focus on something else, clean your thoughts (literally, imagine your mind being cleaned to a white blank place.) visualize all that tension go away, it may help you.