Things I think about before coffee

I had a lot of trouble keeping my mind on the whole getting-up thing this morning, because it was obsessed with tribbles.

Now, they are born pregnant, which means when tribble A gives birth to B, B is already pregnant with C. Does this mean C is in B while B is in A? How deep does tribble-ception go?

Or does the process of birth trigger becoming pregnant? In which case, are tribbles child of one parent (B → C) or two (A, while giving birth to B, also impregnates B, so A + B → C), and if the latter, how does that affect genetic inheritance?

For that matter, how do tribbles even gene?

(I'm sure somewhere there is an article researching this)