TMI question!

After having sex, I usually lay on my back with pillows under me to try and get my husbands swimmers to go where they're supposed to, but the second I get up I feel like SO much ends up coming out of me. Is this normal? I know they can last up to 5 days and there are billions of them, but I'm nervous that very little are getting left inside me... should we have him tested for infertility??