caveat: I do not claim to be a medical expert, but I have studied it a little bit
There are two types of hormonal contraceptives in use: One of the methods uses a combination of estrogen and progestogen (two hormones involved with the reproductive cycle). The other one uses progestogen only. They can both be administered in varying ways, one of which is an oral contraceptive. (Other ways include patches, implants, as a component of an IUD, or injections…but the mechanism works essentially the same)
There are basically three mechanisms that either of these types of contraceptive use:
The first mechanism inhibits the development of follicles within the ovary that then produce the eggs. This is the primary mechanism upon which they depend. No eggs…no pregnancy.
The second mechanism changes the viscosity of the cervical mucous, thus making it more difficult for sperm to leave the vagina and enter the uterus and fallopian tubes. If the sperm doesn’t get to the released egg…no pregnancy.
The third mechanism is to atrophy the endometrium, making it far less likely for a blastocyst (an early stage baby) to implant.
Now, here’s the little trick used by the medical community:
- An abortion is the early termination of a pregnancy, right?
- Well, “big pharma” has worked to get pregnancy officially defined as from the point of implantation, not from the point of fertilization.
Therefore, using terminology acknowledged by the medical community, birth control pills do not technically cause abortions. However, using the terms of life, one of the mechanisms that birth control uses is that it can. We pro-lifers believe that life begins at the moment of fertilization.
So there are two questions for your wife to ask?
- Can this birth control method prevent implantation of a blastocyst? (If the answer is yes…then as a pro-lifer, her answer should be no, thank you)
- If they hedge on the answer to the first one, the next question to ask is: do the effects of this birth control include a thinning and atrophying of the endometrium? If the answer is yes, then consider that an atrophied endometrium will not allow an egg to implant.
The best thing to do is to look into Natural Family Planning. Done right, it is as effective if not more effective than any artificial method. If you insist upon using some type of artificial contraception, I would suggest that you avoid any type of hormonal-based contraception. The long term side effects are not all that good. You also do take a chance that a baby, in the earliest stages of development, will be killed. A small chance, but it does exist.
Again, I do not claim to be a medical expert. The above is the result of self-study on the subject