Hi, Thanks for using HCM.
Pills are given to maintain the normal hormonal
level through out the cycle. You can't start in between and continue and cant stop in between. You should be adhere to drugs.
2nd thing the chances of being pregnant is there as you are not regular to drugs and not using properly. If you had sex in danger period like 12 to 15 days before your expected period then also the chances are there. You need to wait for some time. If no periods at your regular time of cycle then test for urine pregnancy
test. Otherwise not required.
Hope I answered your question. Feel free to ask me if you have any further queries. Wish you good health. Take care.