Even if you’re not thinking about having children or becoming pregnant any time soon, it’s not a bad idea to learn how to spot the signs that you might be infertile or have fertility issues. Fertility problems are much more common — in both men and women — than you might think: the CDC reports that 6.7 million American women are either unable to conceive or carry a pregnancy to term. Additionally, the CDC reports that 7.5 percent of all sexually experienced men under the age of 45 in the U.S. have seen a medical professional regarding fertility issues — meaning that 3.3 to 4.7 million American men have sought help with fertility in their lifetimes.