My wife (when we were dating in high school) said it 2-3 weeks in. I panicked super hard. Like it's a lot of commitment. We obviously stayed together, but retrospectively it was a bit intense for that point in our relationship. So it's more of a timing thing than anything, and someone's will probably commit early compared to the other and that's okay. It's a matter of being reasonable about expectations even with a "love you" on the field.