Should I take the plan b?

So I did have sex last night. And it was kinda just spur of the moment and he didn't use a condom. He pulled out and everything but he came on my leg pretty close to my 🐱. When I put my bottoms back on I think some got on the inside side of my bottoms too. Old if I'm just tweaking bc this was my first time (Was a virgin before) and I'm kinda nervous to take the pill. Do you think I should?