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I use an app called period tracker, you add the dates you come on and finish and it works out when your fertile period is. You can adjust the length of cycle and length of period and also log when you bd etc.

Then you could use the ovulation sticks the day before the app says you should be fertile and see if you get a positive and go from there??

(forgot to add....I only use the free version!)

First you need to know the length of your cycle. Then, you start testing 17 days prior to the start of your next period. So, if you have 28 day cycles, you would start testing on CD 11.

In addition, use the "My cycles and two week wait" function on this app (see top right side bar) & enter your cycle information to have an idea for using OPK for your next cycle. If you are in a hurry to get going this month buy a set of OPKs from the grocery store or internet cheapies off amazon.com & start testing as noted by eag923.