Unless you aren't using proper lubrication, or are not at allk aroused yourself (both bad ideas), you're nevber going to remove a dry condom.
Women produce their own lubrication when aroused, and the lubricant that is on the condom already, and which one uses to keep it lubricated, is also going to keep it frm being dry on the outside.
If you used a condom for ALL genital contact and it did not rip, break or tear (I assure you, it's pretty obvious when it happens), chances are very high that that use was 100% effective insofar as birth control. Pregnancy is not generally instantaneous, so, it is possible -- if no method is used or a method fails -- to become pregnant days after the incident, meaning that if you were to become pregnant this cycle (again, unlikely), you would likely skip the next period, not this one.
To chart your cycles, you count Day One as the first day of your period, and continue counting until your cycle ends with your next period, at which time you start at Day One again.
Editor and Founder, Scarleteen
My epitaph should read: "She worked herself into this ground."
-- Kay Bailey Hutchinson