Plan B Help?

Hello, it’s my first time taking plan b one step. I took it within 24 hours so I don’t think I’m pregnant but within a couple of hours of taking it I noticed a very feint, mostly white but a little bit of pink discharge? There’s no other symptoms besides an ever so slight cramping- but it’s a barely noticeable pain. My fertile window doesn’t begin for another four days? Is the little spot of “blood” normal after taking Plan B one step? Thanks girls! Happy holidays! xoxo