The exact number of sperm drops needed to get pregnant is difficult to determine as it depends on a variety of factors including the fertility of both partners. Generally, however, experts believe that around 100 million sperm are released during ejaculation and only one needs to make its way up through the cervix, uterus and fallopian tubes in order for fertilization to occur. It's important to note that not all sperm will be able to reach their destination due to various factors such as limited mobility or quality issues with either partner's reproductive system. Therefore, even though there may be an estimated 100 million sperm present in each ejaculation, this does not guarantee conception with any certainty. Furthermore, it takes more than just a single drop of semen containing those millions of individual sperm cells; rather multiple successive attempts by the couple over time are necessary for successful fertilization and pregnancy.