Weird discharge + cramping and a plan b

Had unprotected sex two days ago, said he pulled out in time but I’m paranoid so I took a plan b anyways. Noticed a little bit of a brown tint when I wiped immediately after (he was big). The next morning I had watery yellowish brown discharge when I wiped and a cramp in my left ovary so I took a plan b when I got off work. Just wondering why my discharge looks like that.