The semen, especially in teenagers, is created in larger quantities than in older men on a regular basis. This quantity has to be released on time in order to keep its consistency. Therefore, when the semen is not released out of the body on time, its viscosity is changed and certain of its components turn into the globules you described. This does not decrease the potential of the semen for pregnancy significantly.
So, it is likely that what you experienced is quite normal and you do not have to be worried. In general, if semen is left out of the body after ejaculation for a longer period (for example, in a condom), globules more than likely would start to form on their own.
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