I've been on the same birth control for about 8-9 years now and have always gotten my period on the Wednesday of my break week (Sunday start, so day 4 of the week). About a year ago, that day started fluctuating between Wednesday and Thursday. I know my body isn't a machine but I didn't think much of it.
This month, I was late on two pills (not in a row) early in the pack and took Plan B after I had sex in the second week of my pack to be safe. Yesterday, the first day of my break week, I had some brown bleeding that has continued on into today. I usually get this at the beginning of my period on Wednesday or Thursday. It is lighter but the same color as usual.
Should this be a cause for concern or should I chalk it up to Plan B and take a test at the end of the week if it doesn't get heavier?