I wouldn't think taking it later in the day would have an effect on spotting. Only if you forget one or a couple it might.

Doctors and nurses will always tell you it's normal to get spotting on the pill. I never used to bleed between periods then all of a sudden i'm bleeding for 2 weeks solid. Almost as heavy as a period. Well I rang up family planning they said don't worry about it, and a second nurse told me it was common too.

So hell, a few specs of blood when you wipe should be just fine dont worry!