It could only be worrying if you have mistakenly send BTC or any crypto to the wrong address but if you were sure that is right, you have to patiently wait for it because it surely will arrive pretty soon. I know we think about the instant transfer but sometimes delays could also pertain as heavy network traffic will rise or because of small fees. In fact, I've experienced more than 24 hrs before (pretty worried) but I'd realize that it actually be happening.

You'll just be calm, worries won't let the transaction maked faster. This could be a lesson for you as well and you know fees will something to drive prioritazion and this is what exactly happens to you. Make it higher in the next top.