1ke and The little lady had already answers you correctly.
So I will just add some informations that may be the barrier of language that you evoke.
Traditionally, and also in catholic language, conception is the union between an egg and a spermatozoid that form a new life, a new human being.
I think it is the definition of almost all dictionnaries, and common definition evrywhere.
Implantation is when the little embryo implanted himself in the uterus.
But recently, some decades ago, the notion of fertilization had appeared in English language to define the union of sperm and egg, and reimplace conception.
Implantation is sometimes substituted by conception…
And an embryo is sometimes now callled a pre-embryo until he implanted himself in the uterus. (More in UK, I think). With argument: for twins, the separation take place in the tubes.
Why that language changes? Because of an attempt to skirt some bioethical problems.
To not feel bad morally to take or promote the birth control pill first.
Then, after, very usefull to try to resolve moral anxiety over Fecondation In vitro
And more recently, for acceptance of morning after pill.
By changing words, we hide some thruths, that can be unconfortable, to make them confortable and accepted by everyone.
So we have to be carrefull in English,to be sure that we speak of the same thing, moslty when it is people who don’t believe in life’s protection at every stages.
In French, we don’t have thoses language problem. Conception is conception. We can sometimes used fertilization, but it is very unfrequent.
But that does’nt mean that thoses things I evoke are much more accept than in the US on the exterior. In France, it is just political uncorrectness to bring a public discordant word; Thoses how personally opposed keep that just very private.
Was I cleared?
What the german language is?
Note: the pill act in 3 ways (not perfectly of course, and some baby born after…):
- inhibit the ovulation (not always, and depend on the pill)
- dry up fertile- type cervical mucus (that’s why, women on the pill often don’t aware of mucus changed).
- change of the endometrium, to make him hostile to the implantation of a child.
This is this last one, who are against the new life. Some people very technical, will said it is not abortion because pregnancy begin in the implantation, which is true, but it is still the loss of an unique genetical human being. there is not nothing before.
And it is not acceptable for Catholics.