The green pills in Pimtrea contain estrogen and are placeholder pills. You don’t have to take them but they may decrease the likelihood and duration of your withdrawal bleed each month. Pimtrea is a combination birth control pill and contains two hormones — progestin (desogestrel) and estrogen (ethinyl estradiol). Each pack contains 21 dark blue active combination tablets, two white inactive tablets, and five estrogen-only tablets green tablets. Once the green tablets are gone, start a new pack the next day, regardless of whether you have gotten your period.