taking pill, breaks, dates etc

hi, dunno if anybody can help me on this one. the way my breaks on the pill are working, i will hav it on both my birthday and starting uni. is it possible on the next break to keep the break goin say longer than 7 days, perhaps 10? i dont hav sex whilst on my period so contraception during that time isnt an issue. i wud run packs together but lst time i did that i suffered a lot of breakthru bleeding in the second pack. or is it possible to run a second pack into the first but hav the 7 day break part way thru that pack? jst generally any ideas of variations that wont get me pregnant wud be greatly appreciated (if they are possible that is.....) thanks x