Women have hormones, and they're mighty strange when one is pregnant and even isn't showing yet. These hormones can quadruple stress, until she may hit some dumb male who isn't using his brain skills. If he hits her back while the hormones are stressing her, he could cause her to miscarry her child.
If you hit a woman at any time in her life, you got some 'splainin' to do to St. Peter at the gate when your life is over. Heaven help us, but some of you guys are sure stupid sometimes about women. So once more, I reiterate: "eeeeeeeeewwwwwwwwwwwwww" on you. Start using your brain, boys, and some of you are girls who aren't acquainted with hormone stress that can't tolerate bs.
And if you have a slight recollection of your Dad or even your mom, telling you "NEVER hit a woman," you had a great parent who hoped their warning would be your guide in future days when they're not around telling you what you must or must not do..