What the heck!!!!?

So, has anyone else bled unexpectedly in the middle of their cycle??? This has NEVER happened to me, and it started as brown spotting then had a tinge of pink. And now its almost full on bleeding. Granted I was supposed to start ovulating today. I just don't know?! last time I had any sex was CD 10 its CD 14 now and the spotting started the 12th day or 13th. This is truely wigging me out.