Can pescatarian and crazy abt gym get pregnant?

Elsa • 36 gave birth to my #1 in 2017, married since Oct`13. Hoping for baby #2 but yet to try.
My friend got married in Dec 2012 and she has tried all sorts of western concieving method. She is also taking chinese medicine to strenghten her body.
But I don't understand how is she going to get pregnant by becoming a Pescatarian (someone who doesn't eat meat but eat seafood and vegetables) and she workout at the Gym so often like almost daily.
Sometimes I really want to just tell her to let loose and mayb she get lucky to b pregnant by eating well & sleeping well. 
I add on that she has tried IVF recently but it was not sucessful. 

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