Prenatal vitamins , pills or gummies & weight loss

So does anybody have any suggestion of some prenatal vitamins, pills or gummies that I could take to boost my fertility and prepare myself for a healthy pregnancy when the time comes. I’m planning to start dieting soon because I’m sick of being overweight. I’m kind of ashamed to say that I’m almost 300 pounds and I’m only 19. I just wanna be healthy and happy for myself. Any suggestions? This is a picture of me when I was about 5 1/2 months prego...but I still look the same smh and I just wanna lose weight

I’ll take a picture later today when I’m not so dressed up, and minus a filter, this is my most recent full body pic so sorry..

Any advice though ?