Definitely check with a doctor to get your vitamin levels checked before taking supplements though
I took 10000icu off vitamin D3 and took k2 to help my body absorb the high dose of D3 …. Look up the proper dosing but taking this regularly helped my health across the board and i got pregnant. Stop taking it once you conceive or feel pregnant
My sister suffered several miscarriages between her daughter and son. She had her blood levels checked by a chiropractor (who did homeopathic medicine too) and found that her vitamin B levels were incredibly low, most likely due to prolonged stress. He prescribed a strong b complex supplement (and probably other things like de-stressing), and then she was able to carry her boy to term, followed very soon after by another daughter and a couple years later by a surprise baby boy.