Weird period or pregnancy?

So on the 28th ( 6 days after my ovulation) I started bleeding like a light period but there was still a good amount of blood, then It stopped for a couple days and I got this really intense back pain in my mid back like I could not move followed with extreme thirst and full feeling breast with nipples sensitive to the touch. I started having light bloody/ brown discharge around the 31st but usually my periods are pretty heavy and super regular. I don’t know what to think of all this.... any help?? Usually my periods are regular and I just have the usual craving and light cramping so this is looking extremely different then was I’m used to. ( also pretty sure I had sex around my ovulation date 😬)