A childhood belief about reproduction

I understood how babies were made at an early age but was hazy on the details. I thought that the first time a woman had sex, the millions of sperm cells would fertilize every egg cell all at once. From then on, each month she would release a fertilized egg at ovulation and become pregnant unless she took birth control pills to prevent implantation. The first man she ever slept with would be the father of all her children. This explained why people made such a huge deal about waiting til marriage.