Period is 22 days late

I have been cramping on and off all day and have had pinkish blood on the toilet paper. All the pregnancy tests I have taken since missing my period have been negative. I have been taking biotin and read online the first part of the week that biotin can cause a false negative. So I haven’t taken the 5,000 mcg biotin since Sunday night. I took a pregnancy test Wednesday afternoon and it was negative. I’m going to take one first first thing in the morning. Do you think this blood could mean anything?