It is not the volume of sperm that is needed to make you pregnant as it takes only one sperm to make you pregnant. What the volume of sperm ejaculated does is insures enough sperm survive the trip from the vagina to the fallopian tube to meet up with the egg.
One drop of ejaculate has thousands of sperm in it, more than enough, if all are healthy, to make the journey. A full ejaculation has millions of sperm in it and thousands of sperm will end up in the fallopian tube. The first to make it to the egg and penetrate the egg wins the race an you are then pregnant if all else goes right. [ adviceman49's advice column | Ask adviceman49 A Question ]
Attention: NOTHING on this site may be reproduced in any fashion whatsoever without explicit consent (in writing) of the owner of said material, unless otherwise stated on the page where the content originated. Search engines are free to index and cache our content. Users who post their account names or personal information in their questions have no expectation of privacy beyond that point for anything they disclose. Questions are otherwise considered anonymous to the general public.