I had unprotected sex at 3am on sat the 29th and took the plan b one step at 11 sat night I had side effects such as nausea and terrible abdominal cramps and my breast were tender as well for 2 days...however my period had just went off three days ago and I did not spot or bleed at all and I was wondering did it work since I didn't bleed like everyone else still waiting for my period which isn't due until then 20th of the month?