I am not sure if you are talking about a progestin implant in the arm or the IUD in the uterus. Both cause amenorrhea
or lack of menstruation
. There also associated with weight gain. Progesterone
can also cause some bowel distention and increasing gassiness. I would recommend that you take a pregnancy
test. My guess is that you are not pregnant because the long-acting reversible contraceptives such as the arm implant or IUD have a very high effectiveness more so even than contraceptive pills but the pregnancy test will answer this question completely.