Is the weeks estimator worth the money?

Davee • 05/31/09 and 05/23/16 Both are my rainbow babies!
Just wondering g if the weeks estimator (it is based on how many weeks since ovulation) is worth the money? I got my BFP yesterday and it'll be another week to two weeks before I have an ultrasound and I just want an idea since my cycles are so long and varied by a couple of days... So I thought about getting the CB weeks estimator today... Comments welcome.

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