Getting pregnant after Mirena

I'm getting my mirena taken out soon because the SO and I are going to start trying (yay!!!). I've had it in for about 18 months. How long will it take for me to get pregnant? Also, heard of the fertility drug Clomid. Is that something I can ask for now to improve my chances, or is that more of a "we've been trying for a long time and nothing is happening" thing?