Is it okay to remove NuvaRing slightly early (less than an hour)?

I inserted my ring some time between nine pm and ten pm on the ninth. When I remove it on the 30th for my out week I'm planning to remove it at nine pm. Is this okay, even though the ring was originally inserted shortly after nine pm? Sorry for the stupid question, I just want to make sure I won't end up pregnant for taking my ring out to early.