My husband and I have been trying to conceive for over a year now. I am now seeing a fertility specialist who prescribed me (1) Letrozole (to take on days 3, 4, 5, 6 and 7), Premarin (0.625 mg) (to take starting on day 8) and Duphaston (to take starting on day 3 after ovulation). In addition to these I also take Materna (prenatal vitamines ) and red raspberry leaf tablets (both every day whole cycle)

My question is: is it safe and recommendable to also take herbal supplements, such as Evening Primrose Oil tablets (period till ovulation) and Flax Seed Oil tablets (after ovulating) in addition to the hormonal supplements my specialist prescribed?