welcome to healthcaremagic forum
be relax and give up all worry
there is no harm in night fall or masturbation
production of semen is continuous process and can not be stop
so it is natural that if you do not fetch it out ,it will come its own .
as body has limited storage capacity .
so dont worry and take deep breath
you have no problem at all
you are all right ,there will be no problem in your future
i hope i have give your question's answer properly