I have been on marvelon for years, my last 5 months have been run back to back for conviencience so I and my GP agreed cerazette would suit me better, she told me that I could disregard my old pill pack and start straight away with cerazette. On day 4 ish I had a 6 day period which has now finished and have been on cerazette for 12 days, am i protected from pregnancy yet? and if not when will i be? Thanks!