missed pill

Shannon
Hi i was just curious i've been so busy with work and everything lately that i haven't realised i never started a new packet of contraceptive pills since my last lot finished on the 3rd of march this week is supposed to be my real fertile week and as i've only just remembered inahvent taken the pill i have actually been having in protected sex almost everyday since i've been of the last pill to today and i'm three days into fertile if instarted taking the pill again today will it do anything like prevent it still or is it to late