No, in our modern or anyone's more-than-modern society, personal strength is not a limiting factor for any job assuming personal wealth or the equivalent available for use in acquiring mechanical means to assist or achieve a task.
Nor need pregnancy overly limit, directly, such things either. Can a pregnant woman steer an oil tanker better than a hugely muscled man can use an oar to jack a canoe around in whitewater? Can she say "Robot, fetch me that boulder" when she need a 500# boulder?
In practice, pregnancy is likely to be limiting in an indirect way as the prospects for any child are bright whereas in 1800 BC (oops... BCE) half a woman's children likely didn't make it to 5 years of age any better than a poor Bostonian woman's children in 1776. But that's indirect.
What is truly limiting in practice is the fact that the longer a child gestates and then takes to acquire some useful self-sufficiency, the fewer of them any given woman can have reach their own breeding age. So the more of the women you constantly risk, the less likely that your society is sustainable at any wealth level that depends partly or completely upon increasing numbers. (That mix also allows for the marginal wealth to keep grandparents alive which is a factor that has been shown to noticeably increase pre-modern population's durability and continued increase.)
Or a short way of looking at it, Becky might be beefy enough, skilled enough, and inclined enough to out-hunt the daylights out of me. Along with her friends. But LUCK likely played a huge role in life-after-hunting for such folk and if our band has 14 breeding women and seven males die one day in a hunt for antelope that fed the lions instead, I and my clique of 2-3 males can easily keep the mateless women pregnant. Bearing in mind that pre-modern family units were highly organized to have the entire range of skills and behaviors to just barely make it, economically, and that that had plenty to do with children surviving to their own breeding ages, but without those seven men, we can still churn out a lot of babies and have a shot at it. If Becky and her clique of six friends are the lion food, that leaves just half the women in the band which is a monstrously huge "other thing."
So THAT, once chimps and such began hunting in an important way, was probably more the determinant that lead to PREFERRING that the males hunt and risk the dangers of the wild and the fights to the death with as big a bunch of animals as they could manage. Or thought they could... while the child carriers who had to contribute years not seconds to the bringing of a child to minor self-sufficiency, much less breeding age, stayed more together, hunting the vicious plant life that provided something like 80% of the calories, and in probably otherwise less instantly dangerous scenarios to fill the days. Lose a few, not a lot, men and things CAN go on. Lose a few women and the population effect might be huge.
So preference. And naturally, judging from nowadays, choices swiftly became "the natural order" and cemented into societies as the only way possible. Consider all those pioneer women dropping their foals while pulling the plow for their husbands, wiping the brats down and wrapping them in blankets or whatever, then back to pulling. And 30 years later, US society is a wee bit wealthier and cannot contemplate women as anything but hoop-skirted fainters.
That seems the likelier source of the idea "women can't do what a man can strengthwise" and it really wouldn't seem applicable today as nothing any of us do is anywhere nearly as life-threatening as hunting lion food in lion country with sticks and rocks. "Here Fluffy, let me take that food right out of your mouth..." creating situations a whole several levels of danger greater than even a nasty OSHA violation. You don't risk the childbearers in such situations if you have a choice. Not a matter of they can't contribute, but a matter of not a single person thinks it's better if they do including them. And while there is then physical optimization for each group's CHOSEN roles and that is then easily misunderstood by later folks as the natural order, it comes down to a very sane choice, not a limitation.
And if it wasn't truly a limitation 25,000 years ago, but rather a smart choice, it SURELY isn't a limitation today or in any society equivalent to mid- to late-1800's America, or more advanced, especially REALLY more advanced.