A birth control pill or patch has more chances of success with bust enhancement if it contains an estrogen with a progestin rather than a prolactin.
Birth control pills (BCP)
For herbal breast enhancement, the herb schedule for menstruation and secretory phase should work with birth control pills. BCP may cause growth with the right combination of herbs taken during menstruation, but BCP interrupts follicular production of hormones that assist in breast enhancement for proliferative phase, and stopping BCP during proliferative phase usually causes minor decreases in breast size. Unfortunately, stopping BCP (even during proliferative phase) can also increase effects of testosterone (androgens). There are plenty of variables of the combined use of herbs and BCP. I can inform you, but I cannot be responsible for odds of birth control
Herbs may interfere with birth control, especially from menstruation until after ovulation. For birth control purposes, it is better to limit herb use to late secretory phase, but there is always the chance of herbs interfering with BCP to allow pregnancy to occur. Any herb can interfere, but be mindful of herbs that (sometimes conditionally) promote menstruation or that can shorten secretory phase like vitex, mint, fenugreek, rosemary, basil, pueraria, ginseng or lavender.
Progestogens, including from BCP, naturally break down into androgens and mineralocorticoids. Because of this, the right combination of herbs taken together with BCP can increase breast enhancement, as opposed to taking herbs over 10 minutes later which can be counterproductive. If you're having symptoms of low estrogen, birth control pills can make it worse, especially during proliferative phase. Birth control pills likely have varying potencies on ERα and ERβ.
If you're using birth control pills for hormonal balance, and not for birth control, depending on if the hormones are equally distributed in the pill, it's possible that fraction of that pill can be used at a time.
It has become more difficult to determine phases of the cycle to use herbs when birth control pill was taken. Also, when BCP use was stopped, androgenic symptoms have emerged before. BCP use with herbs may be difficult. When androgenic symptoms emerge, eat dietary fiber such as brown rice.
What about birth control patches?
It is easier to imbalance on hormones when using a birth control patch and any herbal program. Patches constantly or periodically release progestogens and a lesser amount of estrogens. The body has to balance progesterones that the body converts into androgens, mineralcorticoids and gluccocorticoids. If the body does not balance progestogens enough, by converting androgens into estrogens, continuing to take herbs and birth control can lead to estrogen deficiency. A patch has the ability to release more progesterone, before the body can convert androgens formed from it into estrogens.
I'm unfamiliar with birth control patch brands, but they have different potencies of hormones and their metabolites.
Programs that used contraceptives
Jellie's program uses a contraceptive implant and birth control pills. There has been results with the combination of a herb program and this. Implants are not recommended for the sole purpose of any herbal program. There would also be less control of timing, especially when effects by anything hormonal have been conditional before.
In the hirsutism01 program journal, patches were used at times, and the effect of that and bcp often contributed to more negative effects.
Some successful programs blogged about didn't use any form of contraceptive.