Dr. Dorrien, of swiss medical institute.
the sexually transmitted disease usually takes 1-2 hours when last sexual penetration took place to contract prior to the penis being exposed in the vagina, in your case you had a little slip which can happen depending on the circumstances how ever the question is wether you contracted or not? as you may have read you haven't caught any sexually transmitted disease and indeed washing your genetial parts after sexual contact is a crucial state in eradicating such a disease.