So i had my last period period August 16 and it finished on the 20th. My boyfriend and I had intercourse on the 19th of august (4 day of my period ) and he was using a spermicidal condom but due to our luck the condom broke. 2 hours after the incident we purchased Next choice which is the equivalent to plan B and I consumed both pills at the same time . I then had some bleeding until the 23 august so my period was extended 3 days. I have an app to keep track of my period but sometimes when its off I compare when my period is coming to my sisters. My period is always 3 days after my sisters period (which started 5 days ago ) and the app says my period was due 5 days ago ( the 18th ). I am now 5 days late and very scared. Any ideas of whats going on??