What Causes Lighter Period After Stopping Microgynon?

I came off microgynon in October as my partner and i want a second child, my periods have been pretty regualer, 29 days usally, although last month was 32. I have been doing ovulation tests and normally get the LH surge around day 16. My only concern is that my periods are lighter than usual. They have lasted around 3 days, day 1 and 2 what i would say normal flow but on the 3rd day very light and then peters off. I just wondered if this was anything to be worried about?