Why tf is this happening

I think I’m going to get fired. I work at a buffet type place and I was pretty sick and turned in my doctors note to work but they said they never got it. Soo now they won’t let me work and my doctors office is closed until Monday so I can’t get another copy and now I see that they didn’t schedule me all week at all.. I need this job and I’ve worked my ass off and I’m going through shit and I can’t loose this job because I won’t be able to get another one for a long time and I know that. Please someone can you give me any advice?? My husband is in the military and we’re trying for a baby. If I loose this job it literally might break me I can’t handle this..