8 months and itchy!

I am 8 months pregnant and recently started getting itchy on the insides of my arms where they hit my sides. There isn't hives or anything and isn't spreading and its not all the time. I think it is just the heat. It sometimes gets worse at night. I took Benadryl and it helped. I'm not worried about it but I am just curious Has this happened to anyone else and what did you do for it? It could also be my eczema flaring up has anyone had their eczema flare up when pregnant?