Oh, she looks sooo cute.
And definitely pregnant. My first cat Grisette had babies once but I have nothing to add to what the others said: It was a great experience for me to see how easy it was for her. She was in her box in a quiet corner of the room and got 4 kittens while purring.
Cats are sooo good moms.
It will be a hard time for both of you but a very touching and funny time too. Soo glad that she found you.