Hi,
Thanks for the query.
After removing the IUD it will take sometime for regularization of periods and for returning of ovulation.
This time period will vary from person to person.
It can be two weeks to few months.
The bleeding you are having could be withdrawal bleeding due to removal IUD.
Now after stopping of bleeding, you try to track your ovulation with kit and plan intercourse around the time of ovulation which will increase the possibility of conception.
Take care.

Mirena is a progesterone containing iud. It sometimes causes ammenorhea i.e no menses when used. So i would like to know when you had your last periods. That would decide more if you can get pregnant now.
Since you have removed your mirena on 14th of this month and you have been having on off bleeding it means it is due to hormonal disbalance.
I suggest you wait for your periods if it is due depending on your last menses date. Wait for a fresh cycle after removing iud.
Chances of pregnancy are maximum if you have contact with your partner during 10th to 16th day of your cycle. (1st day of your cycle is when your menses start, from there you count your 10th day)
After using hormonal iuds like mirena, menstrual irregularities are common for first few months. But dont worry as it doesnt mean you cannot conceive. Its just that chances are more when periods are regular as it indicates hormonal balance.