Vitex and Femara?

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Does anyone know if it is okay to take vitex and Femara at the same time? I did last cycle (first cycle on Femara) and didn't conceive.

I'm on cycle day 5 and have been taking it with evening primrose oil. But I don't want it to mess up Femara.

I've seen things on here that said Clomid and Vitex don't go together, but I wasn't sure about Vitex and Femara/letrozole. Thanks!