?

I met a girl today in a Park when I went for a walk taking photos. She was taking photos too so I started speaking to her and we ended up walking around the park taking pictures and talking. I asked her out at the end and she gave me her number.

I text her about 3 hours later with a joke and just to keep me in her mind but she hasn't replied. Normally I wouldn't be concerned but recently I've had a string of girls get weird over texts and so I was wondering if people could give me their advice on how they play things when they just get a girls number.

Cheers