Is it ok to send a couple a wedding gift after their wedding, and if so, what is my timeframe?

Going to a wedding today. I originally thought they were just asking for donations to their honeymoon fund, but found out they actually have a registry as well. I planned on just buying a gift after the wedding for them, but now my mom is saying I really need to get them a gift today...at least a check and card.... show more Going to a wedding today. I originally thought they were just asking for donations to their honeymoon fund, but found out they actually have a registry as well. I planned on just buying a gift after the wedding for them, but now my mom is saying I really need to get them a gift today...at least a check and card. What do I do? First time going to a wedding on my own btw.
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