So I've been off the coil 3months now an I have my first period the 12th Aug an the next period was the 16th Sep so if I've worked it out right that's meaning my cycle is 35 days ? An I have a few different <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">period apps</a> an thay all saying different times of me ovulate so going off the 2 periods what do u ladies think ? As I'm wanting to use ovulation as birth control so I would like to know when I'm ovulate without having to buy test an do them all the time !!!