I called out from work on a day they needed me because I felt sick and now I'm worried I'll get fired over it.

Hello, from the start of the month up to yesterday I was trying to get one day off after i missed the cut off. The week of i start feeling really sick, i feel better by Wednesday and they call me in the next day to fill in for someone. I agree and end up leaving feeling more sick than the day before. I feel like baf through Friday and wake up today exhausted and feeling bad so I call out when I get up which was a half hour before my shift. I primarily feel bad about that but I checked the schedule and three people were running the area I was supposed to be in today and I thought they should be fine. My boss says I'm only calling out because I have plans, I tell her I genuinely am feeling bad and she hangs up. I'm worried I'm going to be fired over this even though this is the first time I've called out this late before. I'm relatively new and disposable since I've only been there for three months now. What should I do about this to make it up to whoever took my shift and for calling out?

usa jobs
usa jobs resume
usa hotel jobs
usajobs
usa jobs federal government
usa job in ksa
usa jobs
usa jobs login
usa jobs gov
usajobs.gov
www.usajobs.gov
usajobs.com
usajobs
usajobs.gov official