@KateF there's not really much veg going on in your diet - and also processed stuff too (sausages, ham, Philadelphia)
Are you eating plenty of fat? Chicken is quite a lean meat - unless you're using chicken thighs and also eating the skin. Are you adding an oily dressing to your salad as well as the mayo? Are you frying the veg for your soup?
The other thing to consider is where your carbs are coming from - do you know the carb count of the sausages? Have you checked the carbs in your mayo? Also beware that Philadelphia isn't carb-free, like hard cheese are.
It could also be that you're sensitive to dairy - although it's a bit hard to be really definitive, based on only two days' worth of meals.
However, as @prettybird says, weeks 3-5 are often difficult weeks to navigate, no matter how much you have to lose!
Why don't you post each day's food here, so we can see if there's anything else you could tweak?