GRAPHIC BLOOD AFTER SEX!!!

So I got fingered really good and then I looked in my underwear and this is what I saw! Some notes: I am not a virgin, I was really wet, his nails were short, I took plan b 2 weeks ago, I have an irregular period (maybe my period is back? I had it a week ago though.. but the plan b could have messed with things)

Also, my vagina feels a little weird inside and really warm! Help!