Is it ok to double text him?

I met a guy last weekend-he was a friend of a guy my roommate brought home. I messaged him on Sunday asking if he wanted to get our dogs together. He was definitely into it. We talked for a bit about school and the last message I sent (which he didn't respond to) was to message me when he got back from his trip and to travel safe. He told me he was supposed to get back tonight. Is it ok if I message him again with my phone number?
Is it ok to double text him?
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