1. Yes you would get a natural cycle with it, but it has the potential to make your periods heavier and crampier
1a. Libido naturally fluctuates so it can decrease naturally but it won’t be caused by the iud
2. Pregnancy can occur as soon as you get it out, because you’re still having a natural cycle and ovulating while using it pregnancy can happen as soon as you get it out
3. Yes it could make your periods heavier and crampier possibly for the whole time you have it or just for a short time, there’s no way to know
But also be aware that if the iud shifts slightly out of place it can become ineffective you need to check the strings once a month to feel that they aren’t longer or that they are even there