If an egg is going to be fertilized and conception is going to occur, it will have to happen in a 24-hour period after ovulation. The egg won’t survive in the fallopian tube much longer than this. Once the egg is fertilized, it will travel to the uterus for implantation. As it travels, it will continue to grow in size, its cells dividing and reproducing. The process of traveling and implanting will take somewhere around 7 to 10 days altogether. True? Does that mean that it has to be ovulation or you won't get pregnant?

Yes, if you do not ovulate, there can be no fertilization and no pregnancy.

However, what many people do not realize is that ovulation does not always occur at the same set time in a cycle for every woman. Important to remember, as there is no time in a cycle that is 100% safe from pregnancy. There is an average time frame which many women's cycles will follow, but many others will not. Unusual circumstances can, and do, happen.