PLEASE help!!!!!

I'm on day 52, I'm 20 days late. Used to be regular for the most part but last cycle was like 40ish days and I had a very light and a little shorter of a period. 
TMI but... that last period was kinda brown as well as very light? Now it's been 52 days since then and I have daily white discharge and definitively white tissue in my urine, but no other UTI symptoms. My back has been hurting and I've gained weight, especially in the past couple months. 
What's happening?!