what is a good diet in this case?

During the first trimester the baby doesn't really need extra calories because it is the size of a pea. By the end of the first trimester you would likely know you are pregnant. Yes, if you start morbidly obese it is just fine to lose up to 10 pounds while pregnant, but those people lost is by eating unlimited quantities of healthy foods, not by restricting foods. Your not pregnant, your trying to get pregnant, and it may take a long time. You really don't have to worry about affecting a first trimester fetus by over dieting and exercising. HOWEVER, eating to little and / or exercising too much may make you stop ovulating. A crash diet would completely undermine your TTC. Also heavy exercise will stop / halt ovulation. I would recommend therefore a 1200 calorie diet, and 30 minutes 5 times a week of exercise. Once you know you are pregnant, you would increase the calories, and you can keep the exercise if it is comfortable for you and the pregnancy is not high risk. You should not actually attempt to lose weight while pregnant, but it is okay to lose weight while TTC. The first few weeks of pregnancy you do need a prenatal vitamin, but you don't need any extra calories at all.

The No/Low Carb diet ( aka Atkins diet ) really does wonders if you are loyal to it. Basically the first couple weeks you'll want to try to not consume any carbs, and after that limit it to barely any!

Set your personal machine alarm to ring hourly—stand in place for 1 to 5 minutes each time it goes off.

On breakfast, go ahead and consume orange juice. But throughout the rest of the day, focus on water as an alternative to juice or soda

Eat too many simple carbs and you are going to gain weight. If you eat to many simple carbs you are going to lose magnesium. If you lose magnesium you are going to be constipated. What makes you fat also makes you sick.

Magnesium: Meet the Most Powerful Relaxation Mineral Available:

http://drhyman.com/blog/2010/05/20/magnesium-the-m...

Insulin Resistance The #1 Surprising Reason You Can't Lose Weight:

https://www.caring.com/articles/most-surprising-re...

Eat fat, get thin: the new diet rules:

http://www.standard.co.uk/lifestyle/health/eat-fat...

Share weight-loss goals with co-workers so one of these invite you for a postwork Zumba class rather than happy hour.

Nosh on baked carrot chips as an alternative to greasy potato chips.

Enroll in an active fine art class, such as sculpture or even ceramics.

Spread hummus, mustard, or pureed roasted red pepper on sandwiches instead of mayonnaise.

Make your low-fat ice cream using frozen bananas and peanut butter as well as luscious cherries and chocolate.