MIL ADVICE PLEASE!

I’m 4 months pregnant. My husband changed his profile picture to a more updated one of the two of us. There were many nice comments complimenting me and my personality. Then, my MIL, replied to one of the comments that stated “She’s a doll”, and said “She can be. But she’s also a she devil” I laughed it off, bc I figured she was just picking, and she was. But then she said something that really hurt my feelings and I cried for a while about. She said “Before she was pregnant she was the sweetest person I’d ever met. When she has the baby I know shell go back to her old self.” MY mother saw the commented and replied “She’s still the same person as she was before...kindhearted etc.” I asked a few people to get their opinions to see if I really had changed that much. Everyone said I hadn’t really changed much, I just cry more but my personality is still the same (which i 100% agree with.) I texted my husband and apologized to him if I treat him differently now and told him what happened. Instead of defending me, he took his mothers side (he’s a mamas boy) and his only concern was why did my mother “take a shot” at his. We got in a huge fight about it. He always takes his mother’s side in EVERYTHING and never defends me and I’m so tired of it. I feel like I’m his 2nd wife and his mom is his first. What should I do?

Edit** I have said something quite a few times. Each time I mention it, we get in a huge fight. Last night when this happened, I even said I wanted a divorce bc I couldn’t handle it anymore.