help 😢

I was supposed to start my period on the 11th of this month, but it didn't come. It's unusual for me to be late, so I began to worry. Two nights ago I wiped and saw a slight pinkish color, but it was barely noticeable. The next day dark blood appeared, but still only when i wiped or just a bit on my pad. Today was the same, up until about 3 hours ago when the only thing that would appear when i wiped was a slight brown color. What could this be ?? Please help!