3 Weeks Ago I Got Strep So They Put Me

3 weeks ago I got strep so they put me on amoxicilin and that gave me a yeast infection. I didn't take any medicine for it bc I figured it would go away after I finished my antibiotics. But it's been a week that I have been off them and I'm still having issues. I don't have the burning or itching as much. But it's still there sometimes. And also, I was supposed to start my period 2 days ago and it's not here.