I use the MY Cycle from medhelp on my iphone. you can get it through the ap store if you have an iphone
Due to not being able to take any hormonal birth control I have always tracked my cycle on my computer on a calander I made. I then started using MC on my iphone.
Just bumping up for you, hon...
i use am app called woman log it's free on my droid but there are a lot of free period tracker programs in the market for smart phones. go to http://www.womanlog.com/
if you have an ipod or iphone you can use an app called iperiod. i use it n my ipod all the time you can track your symptoms u can us it as a diary, note keeper, also if your trying to get pregnant yr ovulation, if you take a pregnancy test it has that in there, wen u have sex i meant it costs like $3. but u can back it up on line thru email. its a really nice little app. if u don't have an ipod or iphone just look up in yr android marketplace search bar n it will help u out.