My periods were 20+ days late when i consulted a gynaecologist and got a course of deviry tablets to restart my periods. After my first tablet, i experienced a few spots of blood but continued the course on the doctor's note. Now I'm bleeding very lightly (almost spotting only), 4 days after my course completion, could this be my period? And can the flow be extremely light because of the meds? I haven't had unprotected sex and all the upts taken tested negative, but could i be pregnant? How can i completely rule out the possibility of pregnancy?