Hello, When taken correctly, birth control pills can be up to 99% effective in preventing pregnancy. However, women who are taking birth control pills do on rare occasions get pregnant. When this happens, it is most often because of something the women did (or, more likely, did not do), not because the pill itself somehow failed to work. One may miss some dose and forget it or you might vomit it out or if you are taking some other medicine like anti seizure medicine or some herbal medicine or some antibiotic,rendering it less effective. You can definitely be pregnant however you may confirm it again by doing pregnancy test by both the ways,urine as well as blood estimation of beta HCG. The accidental increased dose of ELTROXIN has no relation with your pregnancy. Thanks