Cat pregnant? In heat?

Ok I am kind of stumped here. I have a stray in my apartment complex. I’ve been here 2 months and she’s been here way longer. She’s sweet and chill. Recently I have noticed a big belly on her and her ear isn’t clipped, assuming maybe pregnant. Belly is getting bigger too. But now she is wandering the complex crying and rolling around like she is in heat. So I’m confused. Is this a typical behavior of pregnant cats? Or is something else to blame for this expanding belly. She’s a super floof so the pictures are hard to tell but you can see the big ole belly. She doesn’t really love when I touch it but it feels like there could be babies in there.