The midwife got me to thinking of another idea...
Ketiley
Ketiley was born to very traditional parents. Her father was a leading warrior within the tribe, and her mother remains an aid to Charaka the midwife. For her entire life, Ketiley was lectured about a woman's proper role within the tribe. It was quiet a shock to both parents then, when she took up arms and decided to train as a barbarian warrior, a role filled predominantly by the men of the tribe. In the prime of her life, Ketiley was prepared to issue a challenge that, if she won, would have made her the head of one of the lodges of warriors within the tribe. Her ambitions were cut short though when it was discovered that she was pregnant. She has since been stripped of her armor and weapons and sent to live in the hut of the young warrior responsible for her condidtion. To add insult to injury, he's quite a few years younger than her, was previously under her command, and already has a first wife...making Ketiley that much less important within the tribe. Needless to say, she is a very bitter woman.
Ketiley would be a mid to high level barbarian (depending on the range of levels seen in the setting in general and within this tribe in particular). As her position has changed of late, she may have even added levels in commoner or expert to better represent the new tasks she has been assigned within the tribe.
I almost hate to plug it, but the Book of Erotic Fantasy has pretty good D20 rules for pregnant characters.
Chad