Semen gushing out immediately after sex?

I know I can't be the only one. And I also know that just because the semen "falls out" after sex doesn't mean we won't have the chance of having a baby. But what does this mean? And I know it probably sounds stupid but does it lessen the chance of us getting pregnant? My husband cums pretty deep inside me so that's not the issue. I would just like some thoughts and opinions on what anyone else might think or what experience you might have had....