Well done for stopping at 2 slices of pizza.
There's often lots of "hidden" syns in foods when eating out I'm afraid - couscous might have had some in I'm afraid, pasta probably did too, even if it was a "tomato based sauce" coz these chefs love their oils (they do taste yummy) - could be lots of syns?
Your breakfast didn't sound very filling for you - was it? It would have been "free" right enough, on red, green or extra easy - I always try to have something superfree for breakfast too so that I can decide later whether to be on red, green, extra easy or whatever - I usually have a mug of hot water with a squeeze of lemon in, some fresh berries with mullerlight yoghurt which usually does the trick for me -fills me up first thing ( I often defrost some frozen packet fruit with sweetener on it, leave in the fridge overnight to develop a yummy fruity syrup).
The sweetcorn you had would have been free on EE or green and cucumber would have been superfree on any plan. Any fruit you had later on would be fine too - but you must have been starving all the same!
If I had done what you did here, I reckon I would have hit loads of spped symbol foods for the rest of the week, kept syns as low as possible, kept up my water intake and planned my food shopping well so that I wouldn't be too tempted - and HOPED for the best on the scales -

Good luck'n'stuff!