Pregnant stray cat?

This sweet girl showed up on my porch 2 nights ago. It’s extremely cold & snowy where I live, so I brought her inside. After looking her over, it appears her stomach is bulged out & looks like there is movement. I’m wondering is she’s pregnant or just a big girl? I do plan to take her to the vet within the next week or two when I’m able, but any advice or opinions are appreciated. Thanks in advance. Photos of her are attached.