Not a period! Help! TMI

Kay • I love to hold you close ❤️
I am 16 years old and I just now started having this problem but instead of my period im getting this stuff? Yesterday around 11 , I was cramping , and yes I still do cramp but not too bad , and I felt a gush? And it was a discharge with BLOOD in it so I go and put a pad on and for the whole day and night I have not bled YET! Im having this stuff and im afraid something is wrong? It smells like period blood but its NOT and I have cramps...Whats going on? IM ALSO ON BIRTH CONTROL.