Pregnant on pill im sacred please help

So I just found out I'm pregnant again. I had my first son in april 2017. My daughter born at 33weeks via emergency c section in October 2018. I then had my son via c section in December 2019. I've been on the pill since but I found out I'm pregnant again!! 4 months after c section. I'm scared. Doctors said it would be life threatening if I got pregnant so soon.. what do I do? Will I die? Someone help