This can be common but as IBK said it is best to have a test done by the doctor. I would give it a bit longer and then if you dont get it go in.
Congrats on 4 days!!! That is great!!! sara
Your body can go through a lot of changes during the withdrawal phase, and while using for that matter. Your best bet is to have your doctor do a test. Those are the most accurate.
Congrats on getting clean. Keep up the good work!!