Hi.
Thanks for asking in Healthcare Magic.
Mirena IUD contains
progesterone. It releases progesterone slowly for a period of 5 years. Ammenorrhea (absence of period),
bloating, breast tenderness and abdominal cramps are all due to the progesterone released from mirena.
Absence of periods indicate that the progesterone level in your body is high and that may be the reason for the side effects. Though mirena releases progesterone, it does not suppress the regular synthesis of progesterone from ovaries and that may be the reason for the elevated level of progesterone.
Withdrawal bleeding will occur only when the level of progesterone comes down. Progesterone will prevent the
implantation of fertilized ovum in the uterus. Also, an IUD serves as a foreign body in uterus and prevents
pregnancy and so the chances of pregnancy are minimal with mirena.
You are anxious about conception because of absence of periods. Although the failure rate of mirena is only 0.1 to 0.4%, it is better to rule out pregnancy through
blood test as you have decided because that will relieve your anxiety.
I hope this is useful to you.