Identifying what material this ceiling is made out of
If it HAS asbestos after the grinding and removing the entire area and all ventilation in and out of the area is completely contaminated so it's a little late.
Remember that &quot;in the olden days&quot; a lot of people were exposed to asbestos on occasion but the people who were harmed by it had repeated exposure over many years.  People would build homes with this stuff, when they were done the home was completely contaminated, then a month later a new family would move in and nobody got sick.  With the air exchange in and out of those older structures it did not matter after a 6 months or so there was not a free asbestos fiber left.
Something tells me you knew all this already though and you are just looking for confirmation that you won't drop dead a month after you drywall everything.  Well sorry I can't give it to you - although MOST people who got sick from asbestos needed many years exposure there's always some outliers in anything.  Just try not to build a home that is so sealed up when you open the front door your ears pop and you will probably be fine.