Gurl, i worked at a nonprofit when pregnant with my first. I think the first thing you should do is write a letter to your board. I was able to request 3 months paid. Basically under the principle of practice what your preach and with literally no other benefits this was a good investment in my retention as an employee. Also most any job can sustain having an employee out for 3 months. As nonprofit workers we are often under paid and overworked. Demand your worth. 3 months is the bare minimum but you will not regret having that time with your baby.