When should I text her?

Last night I was on my way to the bars, and this cute girl walked up to me and started flirting, It turns out that she was in my class and recognized me. We looked each other up and down, and she gave me her number. (Although I never gave her mine, that might have been a mistake.) I want to text her, but I'm scared to because in the past, every time I texted a girl the same night I met her, I never saw her again. I decided that it might be best to wait until I see her in class again next week. Would that be the wisest move? Or should I try texting her tonight?
When should I text her?
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