I'm pregnant... What should I do?

Now, I'm pregnant. About 3-4 weeks rn. 
I'm 19, he's 23
He already has two children
I go full time uni
It's dangerous for me to give birth, very likely I will miscarry but I also know it's dangerous to have an abortion...
I am in danger when havin this baby but I am not sure if I am against keeping it... Can I have advise? No hate for being a baby killer please... I need help