Trying to put things in perspective for you here.... we can all get a little paranoid sometimes.
~You have not missed a period
~You have not had unprotected sex
~You have not taken your pill too late to be effective
~The test was negative.
Why do you think you're pregnant??
A light period is normal on any kind of birth control. You should enjoy it! And taking the pill 15-20 minutes late is not considered late, just normal. And an hour late doesn't matter. In fact, you have to be really really late before it's a problem.
Hope this calms you down...