Hi, 

I have a sever cramping for 2 day and after that i have black discharge. Its like just spotting  My last  period was on March 20th  is already 10 days late. I did pregnancy test it is negative. I have done my UTI test on april 4th and took SMZ/TMP Ds 800-160 tab.( Sulfametoxazole and Trimethoprim) Is it due to recation of there medicine or something else. Can anyone help me to figure out whats going on. 

Thanks