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what happened?

Kait • Tue, May 23 • Due June 27th

So my cycles are usually around 34 days. Started taking Vitex and premama drink, and it's shortened way down to 25. What the heck? I knew something was happening when I ovulated on cd15 rather than cd20 but thought it would be a 28 ish day cycle. Should I stop taking Vitex?