I had my last period on 15th april 2016...i had intercourse using condom on 22nd april and 6th may....i started taking deviry 10mg from 12th may for postponing my periods as i had a planned tour...i took deviry 10mg twice daily till 16th may...till today my periods did not start...on 24th may i.e yesterday there was little spotting mostly brown in colour...after that i am not bledding normally..usualy i have a heavy bleeding during my cycles...why i am not bleeding properly?