Hi and welcome
With both the copper IUD and the Mirena IUS, fertility returns almost as soon as the coil is removed (it can be slightly quicker with the copper IUD as it's hormone-free); in fact, it is possible to get pregnant straight away if you've had sex within 5 days of removal. For most women it does take slightly longer (as few women conceive straight away due to various factors), but you should settle into a regular cycle fairly quickly.
I personally had a bleed for a few days after removal, then my period followed about 4 weeks later. I then settled into a regular cycle straight after that (even though I had the Mirena 6 months and was on the pill for 6 years prior to that); this is fairly normal, so things should get bac to normal quickly, though for some there can be a delay.
The best advice I can give you is to make sure you're doing all the right things to up your chances of conceiving, like cutting out cigarettes and alcohol if applicable, getting down to a healthy weight and exercising more if necessary, etc. It might also be worth waiting for a period before TTC as then you know where you are, but this is obv personal.
Hope that helps and good luck x