Some clinicians try to figure out if you might be likely to have possible side effects of hormonal implants before they are inserted. This can be done by taking Progestin-only birth control pills for several months, but it doesn't always predict correctly for the individual. Usually, you can't see implants under your skin. However, in thin women, the outline of the implants may be visible. It may be possible to feel the hormonal implants in your arm.
Some women stop having their menstrual periods after getting hormonal implants.
This is no reason to worry. It's not a medical problem. It just means that your ovaries are resting and not releasing an egg each month. When your ovaries don't release an egg, the lining in your uterus does not grow. So there is no menstrual bleeding.