When’s the right time to mention something serious to a girl?

so i seen this girl around at my job and i was immediately attracted. i was nervous to talk to her because i recently joined first shift from second so no body knew me. i was holding off until i saw her today. i was talking to her for a while i got her number and all that we’re still texting. the vibe is good right now but i want to tell her something serious. do i wait on it or tell her now? the thing is that i have a speech impediment and she’s heard it but it can sometimes be seen as i’m nervous or anxious around someone
When’s the right time to mention something serious to a girl?
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