As I've said before, no, she does not look to me to be in foal, at least not so far along that she is due any day, or even any day soon. Obviously she may be in foal from her May breeding, or February, or whenever it was she was with the stallion this spring, but I would be surprised if she ended up foaling "soon"
In the front photo she looks like a narrow framed horse with a bigger belly--not a pregnant belly, just a well fed one. I've got a narrow pony that has a wider belly than that & I know she isn't in foal--though she does look much more pregnant that your girl does!
That still isn't what I'd call a bag--it looks like there's some fluid in there, but as has been said by various people on various threads, a maiden mare with fluid in her "bag" isn't at all unusual.
All the guessing in the world is just that--guessing. You basically have two choices--treat her like she is going to foal any day and watch her like a hawk, or decide that she isn't going to foal any time soon & don't watch her closely. The latter doesn't mean you can't still keep an eye on her, so that you will notice if she does start to change in a big way. Most times mares will give you signs--there are those that don't, but of those that don't...some of them do actually give warning signs, it's just that they are so faint or subtle that unless you're looking at the mare very carefully you will miss them.