Need help clomid

So am about to start my first round of clomid 100mg cd 5-9 and am reading that clomid can thin your lining any recommendations can i take prenatal and add vitamin B complex and vitamin E 400iu i’ve read that can help thicken of lining am just worried of mixing prenatal vitamins with other vitamins i may sound dumb but my doctor didn’t tell me any information so i been doing everything on my own its been almost 2 year ttc and have pcos i really want this to work 🙏🏻