A little encouragement please?

Please scales, just be nice to me? 50g heavier than yesterday and I've been 450kcal under maintenance for the last few days so it'd be nice to get back to the weight I was only just last week. I do know that little variations in the day-to-day should be ignored, but the moving average has stopped moving downwards. I have just changed exercise routines, so it's not that, and I am recording everything I eat (and drink if it's not zero-calorie).

Exercise - 1.5 mile fast run

B - porridge made with water and a splash of semi-skimmed milk, raisins and a banana
S - tuna and soft cheese with sweetcorn
S - cocoa, banana and peanut butter milkshake
L - ham, spinach and tomato salad
S - slice of wholemeal granary toast with houmous
S - tangerines
D - lamb biryani with courgette, onion and toasted pine nuts

Calories (kcal)	1834
Protein (g)	116.7 (26.4%)
Carbohydrate (g)	217.6 (46.1%)
Fat (g)	54.0 (27.5%)
Fruit & Veg	11.3