Could I be pregnant?

So I literally just finished having sex with my boyfriend an hour ago, we used a condom but it split. This is the first time this has happened to us and I’m freaking out.

According to this app and Flo, i’m not due to ovulate for around 3/4 days. I came off my period on 23rd Jan.

Do I need to get the morning after pill (plan b) or am I okay? I don’t even know where to get the pill from and we don’t want kids so I’m panicking so much 😭

Someone please help… Could I be pregnant?? Do I need plan b??