Hard to get pregnant after Mirena IUD

Is anyone feeling that is hard for you to get pregnant after using Mirena? I’ve read lot of comments of wome saying that after removing Mirena it took 8 months to a year for them to get pregnant ... is it a coincidence or a side effect? My doctor said, “you can get pregnant right away”... but it’s not happening ... but I feel like this is only a Mirena thing.

(only for Mirena users please :) )