answer:I am assuming your brown pills are the sugar pills. If you take the pill the same time every day, then pretty much every month you will get your period around the same time on the same day. So if you started on a Sunday (most people do) then your last real pill is on a Saturday, and you probably start your period sometime Monday, or whatever day you start your period, you will be able to predict it within hours. If you throw up within 30 minutes of taking the pill it is possible you did not get all of the hormone I would think. You might want to use a back up method that month. If you are on the pill and take it regularly it should not matter how often your partner ejaculates in you, but just know the pill does not protect you from STD’s. If you haven’t figured it out yet from my answers, it is very important to take your pills the same time of day every day.