I take birth control regularly. I went on a week trip and forgot to takeout with me so I missed the last row of my active pills and bled while on the trip probably because of missed pills. When I got home I had sex with my boyfriend and thought it was fine but still took precaution and took plan b before 24 hours expired. the pharmacist told me to finish that pack and then start a new pack skipping the inactive pills. I started a regular period the next week which was the first of the month it lasted 6-7 days then I had brown discharge for about three weeks. I have not gotten my next period yet but have pms symptoms. I rarely have sex so I am very stressed.. Is this hormone change or pregnant?