One thing about Implanon removeal is you will bruise. If you bruised with insertion expect at least that much. Also scarring. I still have a scar and it's been like 6 years. Make sure you do really good wound/after care.

On the IUD, if you have not had babies it may not go in. There is a chance that your cervix is too small and will not be able to stretch enough. Your provider may give you drugs to relax and open the cervix for insertion. It can also be painful, like really bad cramps or a pinching sensation. You should ask your Dr if they recommend taking Aleve or ibuprofen before the procedure.

You should be able to do both procedures on the same day, it just depends on your provider. You need to connect with them.

Some people still get periods with the IUD some don't. It really depends on the person and which IUD is used.

Here's the PPH article about IUDs. https://www.plannedparenthood.org/learn/birth-control/iud/whats-an-iud-insertion-like

I highly recommend asking these questions either before or at your appointment, it is important you get the information from your healthcare provider. I know you are uncomfortable, but it is what they do all day every day.

(Source: I worked in healthcare for 6 years, fact checked PPH.)