Need Advice 19 year Old woman!

LoveMe2!

My last period was July 29. I have irregular period that comes on every 37 days for 4-5 days super heavy. September 3rd I was suppose to start. So I wore tampon to work cause I had cramps. After work it was nothing but a brownish mix with blood spotting on their the size of a nickel. So I definitely thought I was Abouts to start. But nothing. Two weeks later on 18 more cramps. I spotted very light till 21. To light for pad. So I wore tampon. It didn't fill it up at at all. If I had panty liner would of been perfect. Than two weeks later on October 2nd I wiped and saw light pink blood. After that nothing! I haven't had period since July 29. Recently ive been spitting up Mucus. Light headed. My breast hurts on and off. Head aches. Heart been beating faster randomly. The other day I had the worst cramps followed by diarrhea than afterwards felt better. So Tmi. I tested 3 times last month after I spotted 2days in roll and it was negative. Do you think I tested to early? Or sounds like pregnancy? Not on bc nor do we use protection. I live with my bf. Ooooooo I been losing weight to?