Hormonal pills and coils (IUDs) do prevent the implantation of a newly conceived human life in the mother womb. They are designed to do that as it is a part of birth control. If hormonal pills and coils (IUDs) did not do this, then they would be absolutely pointless to use.
Hormonal pills and some other “birth control’ methods like intrauterine device (coils) very often act in anty-nidation way – while using them, a woman can still have “breakthrough ovulation”, which occurs in millions of women each year. A woman can still conceive a baby (embryo), who because of synthetic hormones cannot attach to the uterine lining and dies!
The pill’s third mechanism is to change the lining of the endometrium (the lining of the womb), which creates a hostile environment for a newly created human life. The tiny baby cannot implant and is spontaneously aborted by the body - similar mechanism works in case of IUD, like Mirena, etc.
Many doctors are concerned about the fact that women often are not informed that the birth control pill can cause an abortion as well as prevent pregnancy. One medical journal declared, “If any mechanism of any OC [Oral Contraceptive] violates the morals of any particular woman, the failure of the physician or care provider to disclose this information would effectively eliminate the likelihood that the woman’s consent was truly informed and would seriously jeopardize her autonomy.