Taking cytotec without being pregnant.

Patient: If I take cytotec (misoprostol) 600mg vaginally, and I am not pregnant, will I still bleed heavy? Would it be simular to an abortion? I had a positive blood test that showed I was pregnant. They followed up with an ultrasound that showed no sac and no baby. They prescribed me cytotec just in case. I wanted to know how will this effect me? Will it be similar to an abortion or a miscarriage if I\’m not pregnant?