Hi Lilian,
I only started on Tuesday properly - I got on the scales on Monday and was 9st 6lb which is the heaviest I've been since I was pg/bf. However, I did have my period which means I was going to be a pound or two heavier than normal.
I'm 5ft 3ins and my clothes size was creeping into a size 14, so I thought it was time to put a halt...my pre-pregnancy weight before dd2 was 8st 2lb, which was probably a bit too skinny tbh.
My portion sizes and fat intake had crept up gradually. Although I normally do exercise quite a bit, my job is quite sedentary. I think I'd fallen into a trap of thinking if I was exercising, I could eat/drink more.
So, since Monday, I have walked the dog for at least 20 mins a day, played doubles tennis twice (for about half an hour one night then a three-hour match the next) and did 30 mins on a cross-trainer last night.
You won't need to exercise as much as I have, especially if you're not sitting down at work all day like I am, but you do need to make sure the calories taken in are less than those you burn...that's why I think FF is so good because you can track easily and it adjusts to your lifestyle.
My target net calories should be 1056. The figures on my dashboard are above that, but that's because I logged Monday when I'd had pecan nuts on my muesli in the morning, and was horrified to see how many calories and fat they contain (it's "good fat" rather than saturated, but still very calorific).
I would say one secret is to vary your food - you will definitely get sick of baked beans - and bulk up with salads and veg which are low in calories but fill you up.
Try to eat low-fat protein at every meal too as this can stop the munchies - I've had poached egg on wholemeal toast for breakfast a few days and have had grilled salmon or skinless chicken, veg and carbs like potatoes, pasta or brown rice in the evening. Lunch has been salad with more protein, sometimes in a sandwich.
Snacks have been fruit and tea/coffee with skimmed milk.
And if you fancy alcohol or another treat, then you'll probably need to earn it through exercise - I'll be going to the gym later so I can have some wine this evening. HTH