Hello and welcome
I have the mirena but I haven't tried to get preggo yet after having it removed. I did have the paraguard (Copper) IUD before TTC #2 and had that remeoved of course. My story is not a great one to compare because I actually had one great textbook cycle right after getting out the paraguard and then started night shift and didn't O for months. In fact it took me fertility meds and 14 months to get a BFP with #2. I don't think any of that was related at all to the IUD, I believe it has to do with my thyroid condition and my night shift wacky sleep patterns.
We have a member right now who had her mirena removed recently and is TTC #3, you can check out her journal in the TTC section... Alicia (four4him)
I believe she is on cycle #4 and had an early BFP the first cycle that didn't stick but now she has had normal cycles. She has a link to her charts which you may find helpful.
I agree with Melissa - check out some of the threads on the TTC board and I'll bet you'll find a lot of women post IUD removal. I wish you the best TTC!