Constant itching!!

I'm 8w 5d and for the past week or two I have been itching like crazy. Mainly under my arms and in the groin area. I've developed a little rash in both places now. I went to the dr yesterday and all she did was suggest some Benadryl cream. Has anyone else experienced this??? And what helped you if so?? 
I feel like a monkey scratchin under my arms all the time!!!