Sperm Viability 20% Pregnant First of all, it is important to be clear that it is possible to get pregnant with 20% sperm vigor. It is not the case that low sperm motility makes it impossible to get pregnant at all. As long as you are able to conceive normally, the embryo develops normally, and all the tests are normal, it means that the sperm for this conception is normal and there is no need to worry about sperm vitality at all. It’s just that with a sperm viability of 20%, the chances of conception are low. Routinely, if the sperm viability can reach 60% and all other aspects are normal, the ability to conceive is relatively high.