Weird brown pink spotting/period/discharge

I'm sorry you guys but posting is the only way I can explain this weird stuff. This is supposed to be my period day two and theres nothing there. Usually I'm heavy as I dont know what. And yesterday I bled heavy but the same brown flaky spotting was present. Along with stringy clear substance. What is this? I am usually a full 5 to 6 days of af. This is just beyond me right now. And two nights ago my breast were so sore I couldnt even sleep. That's never happened neither. Also i had weird cramps. And i just feel off. Is this due to hormone changes? Stress related? Idk. I had sex on my ovulation days but... pregnancy is the last thing on my mind.