because you do not know how long your periods are and they seem to be irregular, I would assume that you Oed after the 3 days of EWCM so more like the 26th... which would make the 20th oops possibly too early (sperm can live inside of you for 5-7 days, 7 being a rare extreme, 5 being a lot less likely than even 3)
however, 20th or 26th, it is WAY too early to test right now. you would only be somewhere between 2 and 8 dpo. Wait a week and test then, if its negative, wait 5 more days and test again. That is, if you dont get AF first.
Artist, photographer, stay-at-home-mom and Marine wife. Mom to 4; a boy and three little girls.