How to know if sperm reached

Kathy
Strange or stupid question I know sorry new here. But how do I know if my husbands sperm is really reaching or staying in? We have been BD this whole week and every time he ejaculates I lay in bed for a few minutes sometimes even put my legs up (I heard it helps) but as soon as I stand up I feel like it just all leaks out (gross I know sorry ) how can I know if it's even enough? Sorry about this but hey we are all here TTC SO I FIGURED WHY NOT ASK! BEsides no question is a stupid question right ? 
THanks ya'lls for your feed back