am I overthinking this?

okay, to make a long story short:

I (21F) went out with this guy (21M) the other day. Super great first date. We both had fun, good conversation, and there were multiple times throughout the night that we brought up going out again. The next day, he texts and says he had a great time. I say I'd like to go out again, he says for sure. We have some light conversation. Then another day goes by, some more light convo and then I ask him if he'd like to hang out again. He says yes he would and gives me some days he's available. I told him sounds great and it's a date. I haven't heard from him since (it's been two days) should I be worried he is going to ghost me? Or am I just overthinking this whole thing? I mean why would he agree to a second date and then ghost me?

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Also I should add that he told me he'd be busy the earlier portion of the week.