Need help deciding and opinions on IUD

Blessings1013
Im on the pills now and would like long term ....i have 3 kids 2 are under 2. And we plan to move out of state so its hard switching it all around and im month to month and we really cnt do another baby at the moment. Im looking to get Mirena. After it was inserted could u feel during intercourse?? Did it fall out at all?? Any problems?? And any oopssies as in pregnancy??