How long did it take you to start ovulating after stopping BC?

I have been of BC since Sept. I was on it for 10 years. I'm worried I am not ovulating. I started bbt charting this month and I have seen no sign that I've ovulated. My cm, cervical position and mood have not indicated it either. My cycles used to be 29 days before BC, and now they are 25. How long should I give it before I start taking something? I'm considering taking vitex. Any advice is welcome!

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