Your cycle length seems to be about 34-35 days. Can expect your period by 1st week of May. Your fertile window seems to be falling between 13th April to 21st April.
But we cannot be exactly sure of this and that's why we do not recommend this method for contraception.
Next Steps
Taking I pill which has a very high dose of hormone regularly isn't safe. You can consult for advice on other safer methods of contraception.
Health Tips
If you do not get your periods even after the 1st week of May, get a
pregnancy test done.