help please

Before this was having sore breasts last week from Wednesday to Saturday, having slight pelvic pain, & abdominal. my Period was 3 days late . Had a few sharp stabbing pain in pelvic abdominal area yesterday. I also started having pretty bad abdominal cramps & random stabbing pain in pelvic are today & my lower back has started hurting really bad today. After I used the bathroom today there was a brown discharge with slight red & in my underwear & when I wiped it was a brown discharge then nothing really. the next time after I used the bathroom there was a good amount of red blood drops come out & it was slight brown with red & after it's only been a very slight brown discharge. I'm really not sure what could be going on normally my cycle is very regular & once I start my period I just keep going a decent amount. I'm also feeling pretty bloated & I haven't ate that much today.