It could be. Then again some spotting is normal when you start the pill, its just your bodys way of adjusting. You may want to wait and see if you miss your period, if you do then test. Talk to your doctor let them know what your experiencing and ask if you should keep taking your contraceptive pill, u want to make sure its still safe to keep taking them even when there's a chance you can be pregnant, you don't want it affecting your baby if you are. Good luck and hope this helped!! :-)