Hallow dear, Birth control pills are reproductory hormones and they act with uninterrupted action on the woman s reproductory system. In fact woman s ovaries release only one egg per cycle. Before that it has to get matured. This is happening by continuous action of the natural hormones produced in the body. Birth control pills interfere in this process by changing the levels of reproductory hormones in the body. Hence they also have to be continuous and uninterrupted. Irregularity in the pills cannot inhibit the actions of natural hormones effectively and pregnancy may result. If you are irregular in taking the birth control pills, you do have risk of pregnancy due to unprotected sexual intercourse. Hence, it will be a safe step to take emergency contraceptive within 24 hours, but not later than 72 hours of unprotected intercourse. If you have not, the risk of pregnancy remains. Since you were irregular in taking the pills, it is rather difficult to predict when your menses will come; however they are likely to be earlier than later. If you miss period, get your urine tested for pregnancy detection 8 days after missed period. Earlier these tests may show false negative results. Beta hCG tests are more sensitive and can give you reliable results within 2-3 days of missed period, may be even earlier. Hope this helps you. Dr. Nishikant Shrotri