Barely peeing?

Since 5pm last night I have drank roughly 64 oz of water. It’s now 4am, only been able to pee twice and VERY minimal amounts.. like a couple drops that I really had to push for. should I be concerned? Is this something I should ask my doctor about at tomorrow’s appt? I’m not entirely sure how long this has been going on. My husband was the one who brought it to my attention I hadn’t been peeing all day like normal.