No it wont ruin your cycle. I hope you know this already but most people always run a ai during cycle. Most use arimadex at .5 ED or EOD while some prefer aromasin. Some use aromasin at 12.5mgs per day while others have better luck with it at 25mgs per day. Aromasin has to be used daily while arimadex has a much longer half life and can be used Ed or EOD.
The post I made right up above yours tells of dose for arimadex and yes you run it all the way through the cycle up until PCT. I think you need to read about half lifes of compounds and more on a proper PCT also just to be certain what you are doing and why and when. There are some great sticky's, check them out.
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