US Immigration from Vietnam

My husband (usc) and i are not sure if we should hire a lawyer for my case or just wing it.

I came here on f1 visa and accidentally got pregnant. After finding out, I dropped out with the intention to go back to my home country for an abortion. That now has changed as we decided to get married and keep the pregnancy. We got a courthouse wedding last month with no witness, and are expecting our son this June.

We re afraid it will be hard to prove our marriage to officers as our relationship is pretty new (little under a year,) and we only have shared utility bills starting feb. We ve been living together since november, however only his name is on the deed since we were not married and I was already out of status. We have insurance together, he is an air force officer, so I m in deers and have tricare for 9 months (the longest period allowed without a ssn, just enough time for my delivery). We re looking into obtaining an itin for me so that we can open a joint bank account, and for him to add me as authorized user on his credit cards. Friends and family are aware of us so testimonies are not a problem, but we are not sure if these are enough to prove anything.

Mother in law coming next month to USA on B1 tourist visa from Vietnam. Any recent arrivals can tell me how long the officer at port of entry (POE) gave them to stay in USA? I would like her to stay until August so that she can travel back with my family. We're going on a one month vacation to Vietnam in August. Is it advisable to write a short letter that she can give to the POE officer requesting a 4 month stay so that we can all travel back together?

So we filed the N-400 on the 6th and the 7th they received and sent a "schedule biometrics" appointment letter as well and we have until June 14 to get it done. Being overseas we can do it on base and I was wondering how quickly after sending biometrics are people seeing the scheduled interview/oath?

The USCIS says for the typical 5 year to expect 11 months, but could we see something quicker since we were accepted under the 319b?

At what point would I reach out to Atlanta USCIS to ask for a one day interview/oath?

My wife is from Vietnam. Came to US on K-1 in 2013 .we married, she is now US citizen. She has filed for petition for her brother and sister to come to US paid the fee too. Does it really take all those years for their possible petition to be considered? I don t comprehend the topics or procedures on here at all, so forgive me for not being able to investigate accurately.
I mean the fee is non reimbursed even if things change 15-20 down the road ..can they even come over on just a tourist visa or something?
Please if anyone can offer any particular helpful incite, please respond here, or please personally email me. (removed)

My fianc has set an appointment for late April at the US Consulate in Ho Chi Minh. I understand that I'm not required to be there with her, will being present significantly help the case? I wanted to take a week off my new job to fly to Vietnam and show consulate that I'm present with my fianc . Will it hurt our case if I'm not present ?