Vaccination reaction

My girl will be 6 months on the 25th but just received her 4 month vaccinations Monday. She has flown multiple times and we used to do things quite often and she’s never been sick at all and she doesn’t go to daycare. The day after she had a fever and slept a lot, Wednesday and today she’s barely had an appetite, I know these are normal side effects. But tonight around 6 she started to get really congested and coughing,she is always happy, she was happy all day but she is absolutely miserable now. I really don’t think this is a coincidence so I’m curious if this has happened with anyone else’s lo after vaccines