@martinuzz, when the game says pregnant, think "with chestburster". I don't think giving birth kills you though - read the wiki before I ever caught that, so I've always killed my horrible spawn before it could... well, spawn.
@Cheetar, just to note, you can stash your stuff in any persistent dungeon like that, provided you can clear them out. Vernis also has the Slime Basement, and Yowyn has the Cat House. I've always just used the Den, though - I'm not sure if it has a limit. I recall on the forum or wiki that people sometimes had caches in the randomized dungeons, though since they reset like once every year or so it's probably more of a temporary thing, and you don't want to leave important stuff there.
You could also buy a storage house or wish for a dungeon, IIRC.
@Buri, regarding 2, I transferred my old save from one version to another - 1.13 to 1.16, IIRC - so, yeah, that should be doable. Just drop it in the save folder, I think. You'll forget where all the stuff is in towns, though - that is, all the buildings will look empty until you see the furniture and stuff again, and fruit trees will change what they give, but I don't think anything major changes.
My laptop has a numpad, so I haven't had the issue.
I haven't played in a while, but I'm pretty sure HP increases independent of level, as does pretty much everything else. Level doesn't give much benefit except a couple skill points and feats, IIRC, and enemies scale on it, as opposed to your actual stats, or how deadly you really are. So yeah, it's actually pretty beneficial to be low level.
I had to reformat recently, so all my characters are gone.
I will miss my deathloli and her 3d12+12 claymore.