Russ
Istar
I don't think it's paranoia. If this warrior is a potential thorn in my side how else am I going to beat them? Take them on while at their peak? No, I'm not stupid. Her getting pregnant is when I actually have a decent chance of killing this person. And if she doesn't realize that, she's going down.
Now if Royalty is vital, that person must be REALLY GOOD for them to send her to any front line. I mean mind bogglingly good. If THAT person gets pregnant than Jesus christ, I'm putting a ton of resources into taking her out when she's pregnant and off her peak. She may not even have a line to continue because I'd be gathering my resources and launching an all out attack when she's 8.5 months pregnant? Why? Because I'm not going to get another chance. Certainly not a better one.
You can call that paranoia, but she doesn't realize what's up, she will be dead.
The problem is that your thinking is too focussed on the gender of the warrior and trying to make a point about the vulnerability of the woman warrior on a sex basis that you lose track of all the real issues around such a warrior.
For instance, they will spend about one third of their time asleep, much more vulnerable then when they are pregnant and awake. Or you can poison a great warrior, ambush them with numbers, cut off their supplies (or hair), starve them, attack them from behind, bury them in volleys of arrows etc. All of which is easier to do than actually finding out when your opponent is pregnant, and then trying to get to her at the small window, if you are right about how far she is along (your argument assumes near perfect intelligence and access).
Your argument also fails to make into account the human nature of her followers and allies. People will fight harder to defend a pregnant woman or a woman with a child than they might otherwise. You seem to think about real people as chess pieces or if they are in video game, they are not.
You also don't seem to understand royalty very well either. History is replete with royal leaders of armies leading from the front, not because they are "REALLY GOOD" but because they have symbolic or moral value, or simply, because it is expected of them.
War has never been fought with calculators, the way you seem to want it to be. And your ignoring of multiple factors of war to try and make a point about gender is a weird argument.