Welcome back to the Wefugees Community and thank you for reaching out to us again.
Handbook Germany is explaining the "Mutterschaftsgeld" as following:
If you are pregnant and working, you are entitled to "maternity benefits" ("Mutterschaftsgeld")- you need to apply for it at your health insurance seven weeks before the childbirth. To apply, you need a certificate (from your doctor) which specifies the expected date of birth. You need to send this certificate directly to your health insurance. In case you have a mini-job or are privately insured, you will receive reduced maternity benefits.
If you you fulfill the respective requirements, you are entitled to receive the maternity benefits for up to eight weeks after you gave birth. Therefore, this type of benefits may in general not be relevant for you anymore. For more details, you may also want to see this website by the German government.
Is it possible that the social worker from the Diakonie was explaining about the "Federal Foundation - Mother and Child"? This foundation is supporting families in need - please follow the link for more details.
I hope these information are useful for you and please don't hesitate to get back to us with any further questions.
All the best,