1. Foodwise, dont cut down on food. Eat well and Just avoid processed and junk meals. Eats meats, veggies and organic stuff. Cutting on food can have the opposite effect - your body would be more reluctant to loose fats to increase Ur chances of survival.
2. walking running 3 times a week Is great - make sure u are doing that for like a good hour if it's only 3 times a week.
3. If your goal Is loosing fat, focus on Building muscle. Cardio Is great, but has limited weight loss benefits (in short It only works if you are Always on a big caloric deficit)
4. I am Sorry to hear about your miscarriage but I would think that It Is probably not preventing you from loosing weight. I know people that smoked a lot, drank a lot and ate very bad but were able to get in shape After some period of regular lifting and eating properly. So focus on discipline and doing the right things everyday. you Will slowly see the results.