Dear Do Do,
Welcome back to the Wefugees Community and thank you for reaching out to us.
First of all, congratulations and all the best for you and the baby. On the other hand, I am sorry to hear that your situation in general has not changed much since you reached out to us the first time (here).
Did you get in contact with a counselling office as we recommended before? If not, please consider it again. You do not have to worry that the social workers/counsellors are reporting or judging you - they are working confidential.
As you are not married to the child's father, it is important that your boyfriend is acknowledging the fatherhood. Otherwise the child will not get the German citizenship. In general, you can do this procedure already before you give birth. However, the acknowledgement usually takes place at the "Jugendamt" and here you may be at risk to get reported to the police/the immigration office (Ausländerbehörde). Another option can be to declare the fatherhood at the notary (follow this link for more details).
Please read carefully the information my colleague Alla gave in this thread in response to a very similar question. The whole process (especially since you leave in Germany illegally for a while) will not be easy and I can only repeat my recommendation to get individual support in a counselling office and eventually also by a lawyer.
Nevertheless, please do not hesitate to get back to us as well with any further questions.