Please tell me if I should be mad?

Myself, ny husband my father and my mother in law were all sitting down talking last night, (we live with my mother in law because her husband died last year and she bagged us to move in with her cuz she’s lonely)

I’m 15 weeks pregnant, she goes like “that baby is mine” I said “NO THE BABY IS MY BABY!!”

She got so mad and said to my father “you seee what she said???? She said the baby is hers!!!! She told me the baby is mine months ago”

And literally looked like she was about to cry!

WTF?? Is going on? I’m having so much anxiety 😟

She’s fucking delusional!!!! I never ever said that to her! Why would I ever say that to someone especially her!!!

Is she trying to start problems? Wtf is going on