Hi, thanks for asking in Healthcare Magic.
Miena contains Levo
norgestrel. It is a
progesterone. Probably you are feeling the side effects of progesterone after Mirena implant. It takes few months for the body to get adjusted for the hormonal effects of Mirena. 20 to 25% of women suffer from
amenorrhea (absence of period) although this side effect may not be desirable and creates confusion for young women like you.
If the strings are not felt by your treating Dr, then it is better to confirm the position of Mirena through X-Ray or ultrasound of pelvis. It will relieve you of your anxiety and will further help you decide about the next method of
contraception that you want to follow.
The reasons for absence of thread could be
1. bigger size of uterus due to pregnancy.
2. expulsion of Mirena.
3. either it is buried inside the
myometrium (muscle layer of uterus) or the stings are withdrawn into uterus.
The signs of pregnancy like nausea, bloating sensation and breast heaviness can also occur due to the hormone present in Mirena. Since your pregnancy test is negative, it is better to confirm the presence of Mirena through ultrasound or X-Ray.
I hope this is helpful to you.