You kinda need that sperm to get pregnant.
So yes definately don't rush to the bathroom, infact a lot of women will lie on their back with their bums elevated to help the little guys in the right direction. Women's bodies are designed with boobie traps along the way for sperm so you want to keep as many swimmers inside you to raise your chances that one will make it through to the egg. So when you're all done, put a pillow under your bum, lay back and relax for a while. If you stand up right away gravity will take course and a lot of sperm will leave your body.