We're planning to TTC in march and I had one fitted at the end of may. Totally regretted it, I thought it would be worth it but I've already had it removed because I got on horribly with it.
They're so hit and miss with their reactions, I wouldn't bother tbh. They're such a hassle to get in and out. I don't know about you but the place I have to get mine fitted takes ages to get an appointment as well.
I think it's also good to have a few months off additional hormones before trying.