Disclaimer to say that women's bodies can change at any point and literally no one's opinion matters except their own.
I think we can all agree that at this point it does really look like Anne-Marie is pregnant. I feel like they may have planned it perfectly for her to be due in the summer. I also wouldn't be surprised if they planned the SNT break with this is mind, so they would have the summer off and generally have some more family time in the future.