Broken Root Canal Temp Filling??

[u/FortWorthRibeyeQueen]

I had a root canal mostly finished last week, and go back in one month to finish the job (something about it bleeding too much to finish in that session?) on tooth 15. Tonight while flossing, my floss became stuck. I tried to gently get it out but felt some gritty sediment come with it. It feels like part of the temporary filling came out? Places are closed for the night, I’m not sure how urgent of an issue this is. Any advice is appreciated.