Adjustment of Status - I-485

Hello everyone,
This forum helped me during my green card process so I would like to share my timeline with you too. I hope it helps some people.

Case: Widower was married to UC

Concurrent filling of I-360, I-485 and I-765
My PD is October 2017
Biometrics Appointment Notice October 20 2017 for November 07 2017
EAD Approval Notice December 13 2017
EAD Was delivered to post office December 16 2017
Interview was scheduled (USCIS online case status) October 16 2018
Interview notice in mail October 24 2018
Got my interview in Santa Ana November 20 2018

2 days after the interview: I-360 approved November 22 2018

6 days after the interview USCIS Online Case Status for I-485 went back from interview was scheduled to "Case Is Ready To Be Scheduled For An Interview" November 26 2018

After I saw last changes, I got freaked out because this could be a second interview. I asked my lawyer she said I didn't have to worry.This could be a system glitch. I am hopping not to get a second interview. But every morning, waking up with a headache.

From the interview:
I had my interview in Santa Ana. It took about 20 min. IO was really kind and didn't even ask lots of questions. Questions were like;
When did I first meet my husband
How we met
Did we go to honeymoon and which hotel did we stay
Did I meet his family
When did I move to his place
Did he own the house
What kind of business he was running
Did we ever buy a car together
Did we have a joint account
Did I know husband's family name (IO made me to spell his daughter name)
When did we engaged
Where I was living after my husband's death...

Then started to ask couple of questions from I-485. Basically Yes-No questions.
After finished all the questions, IO told me he didn't need more documents and give me the paper says "Case Being Held For Review"

Waiting game is still continue and God knows how long more.. :(