Looking after drug addicts child

Hi, I am a 25 year old woman and this is my story.

At 6 and a half months I was adopted, the parents that adopted me got divorced a year after I was adopted. They had one child of their own and also adopted a child before they adopted me.The father that adopted me got remarried shortly after and had a child with his new wife. The mom that adopted me also got remarried to a man with 3 boys from a previous marriage.
It was a very big family and I was the second youngest. I found my biological mother using Facebook and finally met her in 2018, I found out that I have 2 siblings as well.

One day my old friend called me and asked if I could fetch her child from school because she would be working late. I went to fetch him and took him home, he stayed with me until midnight while he has school the next day, she finally arrived with a random man out of her mind. I begged that the kid stay by me but she took him. When i went to the bathroom after they had left I found 2 used condoms in tbe basin as well as little straws (assuming used for drugs).
My friend is a recovering heroin addict and I helped her about 7 years ago when she was in rehab, about a half an hour after they left I received a phone call from the man she was living with that, her and the man she was with were creating trouble at the security complex that he stays at. I arrived and they werr passed out in the car with the car on, doors unlocked and the car in drive, with their head weaving up and down when I tried to speak to them. I took the child out of the car and I went to the nearby police department. The child has been with me for almost a year now due to no support from the family because theu believe that the child should go into the Forster care system. The child is dyslexic has ADHD, has aggression and a lot of physiological issues due to the upbringing, they would not do well in being placed at a home and is already 13 years old.

I am now currently in the process of becoming his Forster Parent, I can't believe how much has changed and how well he is doing at school because I have stopped working to take care of his needs.

I recently found out that I am pregnant even with being told I would have to go on medication to fall pregnant due to my PCOS.

My partner is a brilliant male figure in my Forster child's life. Iwould appreciate any help at all to be able to support my Forster Child, in SA we dont get unemployment or any assistance from the government so absolutely any donations would be greatly appreciated.