The literature and SS rep indicated that there is only one nine month trial work (TWP) period per social security claim/approval. They do not have to be continuous months necessarily, and depend on how much you earn that are designated each calendar year at specific amount. This year is $770, so you can earn up to $769.99 and not have it count as a trial work period month. You will still receive SS during these months or in between if not continuous.
Once you meet your 9 months, you have a grace period of 2 more months to receive SS and still be earning whatever amount. After that it stops, unless a change in your status, loss of work and return of disability, and need to file for a reinstatement of benefits, up to 2 years (or 3 that I cannot recall of the top of my head) afterward. You do not get another 9 month trial work period though, ever. There are other particulars, but that is the gist of what I read in the pamphlet I have directly from SS and was told by them of it for the 9 month TWP.
I don't know about the discrimination for SGA and I say this knocking on wood, that I am going to have to take my chances on that the system works as they say it does. I need to find out if I can work as hard as this is turning out to be, 3 days in now. Perhaps it will turn out to be a mistake and I will not lose my benefits before it indicates I should; I pray not.
Meanwhile, thanks for everyone's feedback!