Teen dilemma. Need mom advice.

My daughter is 16 years old. She started dating a boy a couple months ago. They broke up today over text and she told him she was pregnant. She is not. This is so out of character for her.

How do I deal with this? Her and I are close. I don't want to ruin our relationship by snapping on her. I know it won't be heard. I told her that was unacceptable. I told her to be honest immediately. I was very angry and we both needed time to calm down, now she is in her room and I'm trying to figure out what to say to make her hear me. I want her to know I love her and I'm here for her.

I know this is difficult for her because it's her first relationship. First break up. She lost her virginity to him. But what would posses her to say something like that?

Im expecting a call from the boys parents here soon.