More semen greater chance of pregnancy?

The idea behind having a large amount of semen is to help ensure that our species survives. But, you probably already know that. However, keep in mind that it only takes one sperm to fertilize an egg. A male may have a very large amount and still not fertilize an egg, while a male with a smaller amount might. So, to answer your question: Theoretically, yes, having more semen could increase the chance based on the fact that there is more to reach the egg. But on a realistic level, no, because it does not matter how much a male has, so long as the semen reaches their destination.