That's not true. Men have a higher chance of
dying, for instance, over any given period. And that will probably be at least as disruptive to their employer as an employee's absence due to pregnancy.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3222499/
(Numbers for the US, but the pattern is similar globably)
Some of that gender disparity is due to men taking riskier jobs, and the women in those jobs will likely have the same risk of job-related death or injury, but that's not the only contributor to the increased risk.
The average man is still much less likely to die/unit time than the average woman is to become pregnant/unit time, but I just thought it worth pointing out that, contrary to what you said, the risks of injury, illness, and death aren't constant across gender.