HI Well come to HCM Pregnancy is more natural phenomenon this is not just meeting of two organs but several factor plays the role behind this, even with the normal parameters of semen and healthy sperm, perfect ovulation conception not happening why? because female reproductive pipe have so many hurdles and sperm needs to pass that one by one to reach up to the egg, and most capable sperms reaches there but it is not over here, sperm need to get in egg, and for this it needs great effort and luck too, some time all the sperms fails to do that and story overs, but some time single sperm could do this, without any difficulty, so just keep trying this on natural way this dose not need any medicines, good luck.