this might sound like a dumb question but I was just outside giving my dogs water and I was standing…

this might sound like a dumb question but I was just outside giving my dogs water and I was standing in the grass & I didn't notice until I turned the water off and went to go inside that I had about 70 red ants crawling up my legs & all over my feet etc. I felt the movement but I thought it was the water splashing on me, but now I have about 20 bites & im wondering if it's okay? should I be worried?? or are they harmless?