Question about sperm?

Re

Ok so we are trying for another baby..

So I lay down for like 20 mins after so nothing will come out, so I get up right.. nothing comes out im like YEEEES ❤😁 then like 2-3 hours later I feel something coming out and its his cum.... like wth... did any stay inside of me or no... im so confused. Did it just like sit there those 3 hours ...