Fitness before and during pregnancy is important. If your body is not in harmony with itself, metabolising well and so forth, it will not be ready to nourish and protect your unborn baby to the best of it's ability. So for help getting pregnant it is advisable to maintain a healthy weight and be relatively fit. More details can be found at http://howcanugetpregnant.org/help-getting-pregnant/
where you will find lots of information and resources to give you the help you need to get pregnant and have a healthy baby.