Prenatal vitamins? Conceiving? Help!!

I am a young woman age 18. My husband and have been ttc for almost a year now since I came off bcps. I have very irregular cycles. It just seems like they are always getting later each moth. Should I take prenatal vitamins? or the children gummy vitamins? .. Would those help in my chances of conceiving? I just don't know anymore. Any advice on my situation please! Starting to worry I can't have kids? Please help! Thank you for your time.