pill and bleeding

Lily
I'm on the pill I just started my 3rd pack last sunday. I ended my period last Sunday and I just went to the bathroom and I have diarrhea *sorry if that's too much info*😂😂 but I was pushing and I just whiped my vagina and there was a little light colored blood on the toilet paper? Why is this? Im sure it was from my vagina. Is this normal?also I take my pill at 7 pm and I forgot on Tuesday so I took it Wednesday morning if that has anything to do with it