Is this a bed bug?

Hi, we slept in this hostel (Stuttgart) this night and one of my friend found this on his pillow. We didn't get bitten while we were sleeping and this is the only one that we saw. We have checked every mattress and pillow yesterday before we started staying and saw nothing. Should I be worried?

Hi, we slept in this hostel (Stuttgart) this night and one of my friend found this on his pillow. We didn't get bitten while we were sleeping and this is the only one that we saw. We have checked every mattress and pillow yesterday before we started staying and saw nothing. Should I be worried?