You are doing the right thing by taking the prenatal vitamins/supplements. However, you have to realize that it takes even the healthiest of couples up to, or more than, a year of trying before actually conceiving. You have only been trying for about 3 months. It can take several months for the hormones of the mirena to leave your system completely so as to be able to conceive. That's really not that long in the scheme of things.
Typically it's the girls who aren't trying that become pregnant in only a few short months after beginning to have intercourse.
The app you have is only an estimate of when you are fertile, it is not a guarantee. For now, enjoy the practice of trying to conceive and don't stress over it as stress can cause conception to be delayed.
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