iud pregnancy

 I have had skyla iud for a little over a year now. My boyfriend and I don't use condoms but we do use the withdrawal method. the past week or two I have been having some weird things going on. The first thing I noticed was the change in smell and color of my urine it doesn't stink it's just very strong and dark. I am not dehydrated as I drink a lot of water. I have also been smelling a lot of weird things. Crayons, farts, and just an overall heightened sense of smell. Periodically I will have some Nausea but have not actually vomitted. The other symptom I have noticed is after eating the taste left in my mouth is really just yucky. Has anyone had these symptoms for pregnancy. I realize that it is not a very high chance that I am pregnant just nervous. Thanks