Redhawk Caldera well, if this is fate then we'll find a way to cheat

That same weird feeling had plagued Raven for days now, growing both more frequent and intense as time wore on and the weather grew colder and grayer. There were other afflictions too: a bothersome feeling of restlessness coupled with a stark loss of appetite. She was tired too, which both did and didn't make sense in consideration of her other symptoms. Actually, the young Gamma felt like she could find a warm, cozy den somewhere and hibernate like a bear. She was perfectly aware that wolves didn't (couldn't) do that, though.

When she roused on this particular dreary December day and pushed herself to her feet, Raven didn't feel any more or less unusual than, well, usual. But when she took a couple of steps toward a nearby brook to wet her cotton mouth, her body felt strange. She looked down at herself but saw nothing amiss. Blinking her yellow eyes, she proceeded to the water and fetched a drink. The strange feeling persisted, so as soon as her thirst was diminished, she sat down to give herself a closer inspection.

"Um," she blurted aloud when she saw her distended abdomen and enlarged teats. Raven felt a flush of heat pass through her like dry brush fire. There was no way she could be carrying pups—she wasn't even sexually mature yet—but she was showing all the unmistakeable signs of a pregnancy. As her stomach flipflopped, she tried to figure out what else might be causing these strange symptoms. Raven knew enough about biology to know she wasn't facing the possibility of an immaculate conception here.

"Allergic reaction? Uh..." she muttered to herself, looking around surreptitiously. "Maybe I—" She trailed off when she heard what sounded like footsteps coming closer. Raven swept to her feet, her heart suddenly leaping into her throat. Whatever the cause, she looked pregnant. She could get into a hell of a lot of trouble if she couldn't come up with some sort of explanation for this, stat.

Using this as a source, plus taking some minor creative liberties. :)