Hello dear Understand your concern Trigestrel is contraceptive pill and it contain three different color tablet of active hormone. That match the normal menstrual cycle hoemone. The first tablet that should be taken should be from the first red tablet area and then remaining tablet should be taken according to direction of arrow on the tablet. It should betaken everyday regularly on the specific time. After finishing the tablet your bleeding will come in 7-9 days depending upon your cycle length. So do not worry your period will come while using trigesterel. Ut may be delyaed as you are using first pack but after using regulalrly, period also become regular Hope this may help you Contact further HCM for any query. Best regards Dr. Sagar Contact further