I'm hoping for some insights and experiences from mamma bees who have negotiated maternity leave in similar challenging situations as me.

I work in a very small US architecture firm. I am one of 11 people -- only 2 of us are women. I started in July 2015 and, in January, I was promoted to run our satellite office when my ex-supervisor stepped down. So essentially, I work by/for myself in a big town and have 10 other colleagues several hours away.

The promotion was given to me as stretch opportunity -- all the owners knew I had some transferable skills but also knew I had never done the business development and marketing on my own before! The alternative to promoting me was shutting down the satellite office which they had invested many years and a lot of money in. So it's a "high level" position in the sense that I'm the company face in large region and responsible for getting new work and managing it start to finish.

The president said he thought I would need six months to figure out my new role. He runs a very entrepreneurial business -- meaning more than half of us are director/managers who are required to find our own work. (And the other director/managers have 10+ more years experience and connections than I do. My ex-supervisor who quit had 25+ more years of experience and connections than I do.)

Enter now the obvious beautiful challenge: I'm 10 weeks pregnant. EDD 10/1. Back in January, we were doing IVF and "knew this could happen," but with IVF you never really know what's going to happen! That's why I took the promotion and "leaned in" (saying that, even though I'm mixed about that expression).

Some details:
- We are too small to qualify for FMLA.
- I live in the south -- not CA, NY, etc. or in a maternity/paternity leave-friendly state.
- The firm maternity leave policy basically says "we will take into account the sick and vacation policy and all applicable state and federal laws. Just talk to the president and work it out." So basically it says nothing.
- I'm due a small raise in June to basically affirm I'm doing well in my new role. (End of first tri is Easter.)
- Benefits are crap: no SDI. I will have 5 sick days and about 2 weeks of PTO, but the rest of maternity leave will probably be unpaid. DH has 2 weeks of paternity leave. Paid or not, we can survive and will do what's best for our family.
- The one other woman in my firm has been there for 15 years. Has a 5-6 year old, so she has had maternity leave at this firm but she had other office mates to share her work with. She's a bit aloof and I haven't had many chances to connect with her. Given her firm loyalty, I don't feel comfortable calling her up and trusting her with my news, but I might have an opportunity to have lunch with her in a few weeks before speaking with the president. I'm lukewarm on this idea.
- Just for context, there are two staff with serious (one terminal) illnesses. They essentially work part-time, so I think this says the firm has flexibility.
- We will do daycare or nanny but probably ask my parents to stay with us and provide care until LO is 5-6 months.

Some leave ideas...
- 12 weeks, return back FT (already hating this)
- 8 weeks, then 8 weeks PT from home
- 12 weeks, then 4 weeks PT from home, then 4 weeks PT in office, then back to FT at 5 months PP
- or some other configuration that acknowledges that I'm the only one that does my job.

What can I expect?
What should I ask for?
When should I talk with the president? (Could I wait as much as 16 weeks?)