I had similar to you this week.
I had three games on Sunday, which I don't normally do. My last two games were fine but in my first game I awarded a penalty which was probably outside the box. I think I reacted to quickly and didn't want to change my decision. Fortunately for me the penalty was missed.
I also made a 12 year old cry when I told him off for saying F***er when he said Fouler... OUCH!
After that I just got my head down and focused on my decisions. It could be that you wasn't mentally prepared or that you was a little tired. It seems you did ok in the 2nd and 3rd game so clearly you moved on from it. These things happen to all of us. Try to remember why it went wrong and make sure next time your more ready. Remember you aren't go to get everything right, but as long as your fair and are trying your best that’s all you can do.