There's an app: There are several apps that can help you keep track. I would check in w/ your gf first and see whether she feels comfortable w/ you tracking.
Answered 9/26/2016
3.5k views
Ask her.: Day 1 of cycle is first day of bleeding. Last day before bleeding restarts is last day of cycle. Ovulation is 14 days prior to period.
Answered 7/3/2014
3.9k views
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