I have been on my birth control pills for the last three months. However, I was on vacation during the first week of my current pack and missed that week (June 19-26). We did have sex two days before I stopped, as well as two days after the week was over. I am unsure whether or not I ovulated. I am now on the last week of my pills and bled only one day this week. Could this be pregnancy related? If not, what does it mean if my period only lasts one day? I have been feeling very sick. Could this be birth control related? Thank you for any responses.