Are my rights being violated?

Long story short, i have been granted intermittent fmla by my employer for my son with autism, my 2 previous call outs are being used against me because my supervisor marked them as a no call/no show, ive received transcripts from phone service provider for HR showing that my messages were sent within call in time frame, there is a major difference from the time sent to time received, it shows sent times, received times, but now all of a sudden it seems my supervisor is trying to get me fired because he hates it when i have to leave to pick up my son or when i call out. The same day I sent, via fax, transcripts to HR, i suddenly was contacted by manager because "I was red flagged for using personal phone to punch out from work" while still in the building before leaving 3 different times over a month ago, 3 other co-workers utilized same from their own phones and were never "red Flagged". My supervisor also had conversation with my co-worker saying that him and my manager " Got Me on my FMLA" according to my co-worker. Are these incidents violating my rights?