awww, Well your appointment is on 22nd,if you want to pay on 20th ,thats better,if you pay on 21st,make sure until 12 midday,so you wont get in trouble again,because if you pay late than 1pm,its counted on 22nd,meaning ,they havent accept your payment on the time of your appointment,you will be in trouble again on your appointment,so pay it early,the best thing you can do...Good luck dear