In the French speaking Community you can contact La Ligue des familles (www.laligue.be) or ONE (http://www.one.be/)
In the Flemish Speaking Community you can turn to Gezinsbond (https://www.gezinsbond.be/en) or Kind & Gezin (http://www.kindengezin.be/)
In the Brussels Region there is the network for expectant parents and families in Belgium (http://bctbelgium.org)
All of these organisations will help you with any questions you have.
A list of NGOs in Brussels and Wallonia working in the social field supporting families: http://pro.guidesocial.be/associations You can also contact a family planning center (https://www.planningfamilial.net/).
In Flanders, or as a Dutch-speaking in Brussels: http://www.fov.be/spip.php?article48 you can also contact a Centrum voor Algemeen Welzijnswerk (http://www.caw.be/). These centers have doctors, psychologists, social workers, lawyers who can support you.