TTC Cowgirl style!!!

Would you guys say being on top is the worse position for TTC? I was thinking about it after we did it and I thought to myself no way in sperm could go upwards because it felt like it all leak back out as soon as he was done and pull out. I did lay down right away and stayed laying down in hopes maybe some are still inside. Most of the other positions I’m able to keep it all inside. Thoughts ladies ??