Not really sure about this or not..

My cycle is usually irregular, so i never really know for sure when it's coming. Last period was July 17th. About 3 weeks ago i thought i was on my period but it was different than any other time. Darker brown color, & only lasted for about 3 days or so. A week & a half ago my nipples started to get really tender & sore. More sensitive to touch, that's never happened before a period any other time. So i was questioning whether or not i was pregnant. They were like that for about 5 days. Now there's little white bumps around them. Again, never been like that before. Breasts are a little tender. Eating way more than usual. Always starving, even after i eat. Back pain, thick white discharge..I've always been tiny, weighing around 110 or a little less..but ive been very bloated here lately. Took a hpt 2 weeks ago & got a vvvfl. Took a clear blue digi about 4 days ago & it said negative. Im clueless as of now. Definitely not feeling like my usual self. But i need opinions! Please help.