Dear Newtoger, I believe the rights of mental health and disability patients are very well protected by the German constitution. Personal Freedom is valued very high in this country. It can only be taken away (temporarily) when there is a severe threat that a person could harm themselves or others. This personal freedom includes your right to decide about your medication, your treatment and of course your choice to have children.
However, the stigma about mental health issues does exist and people are not always ready to talk freely about their experiences. This is why a post like yours is so important. To be honest and open about your questions and your hopes is the best thing you can do for yourself, your partner and your future children. Good luck with everything!