The "find my iphone" alert went off and I was away from home?

Earlier today I was out from home doing some grocery shopping and all of a sudden I get a weird alert tone. I checked my phone and it said "Find My iPhone sound was played" on the notification screen. I also received an email notifying me that find my iphone was used to find my phone. Nobody in my household could have used any of my other apple devices (mac, ipad) because they don't know my icloud login information. But, I asked anyway and everybody said no. There is one person that knows my login info and I asked them and she also said no. Is there a way I can check who used "Find My iPhone" app to check my phone?