Why would my bank not allow me to use my card?

I got paid today but when I went to use it nothing worked, I couldn’t pay for anything. I don’t have any overdraft, haven’t changed anything and overall haven’t used my card in over a month. I started a new job 3 weeks ago and I felt like I wasn’t going to get paid but the money is there. I just can’t use it. It’s at the worst time possible too as I had plans to take my boyfriend on a date tomorrow and dinner is going to cost $110 and I have a vet appointment for my cat and dog this upcoming week that I’m worried I won’t be able to pay for now. My bank opens Monday so I’ll be going after work but any idea what it could be?

Why would my bank not allow me to use my card?
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