It's normal for the testicles to retract up towards the body just before and during ejaculation. They are supposed to do that. However, they are not supposed to actually go inside the abdomen. If one or more of the testicles goes inside the abdomen, it could be a sign of a hernia. It is a potential problem in that it could get stuck up there, and the extra body heat can damage the testicle.
Are you sure it was inside your body? Because sometimes it just seems like it is all the way up there, but its just the scrotum is so tight that it seems that way - its actually still outside the abdomen.
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raised testicle during sex 
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