so I had started to take birth control pills, for the first time ever, for about 2 weeks. I stopped taking them because I dint like the side effects. right after I stopped taking them I started my period, which was the end of last month. so I had my period twice in one month. right after my period ended, i was sexually active for a whole week, unprotected. now my period is 6 days late for this month... is this normal?