First time mom

Hey everyone, first time pregnancy here and I’m just on here to ask for any help and tips,

Im 21 and have been married for 4 months now.. this is my first time going through this , at age 15 doctors told me i would most likely have trouble getting pregnant because of cysts in my ovaries so i never thought this would happen.. I’m really scared, I never thought i was pregnant and only took a preg. Test because i was constantly feelings dizzy and my head would be spinning , (I’ve always had irregular periods so being only 2 days late wasn’t that crazy for me) but I’m positive and I’ve had a really hard time accepting it, i am excited but having a baby right now when I’m about to start a new career makes me nervous, i want to be able to give the baby everything it will need and i know I’ll have my families support but it’s just scary and a little depressing and i hate that I’m thinking that way, I’m trying not to be negative because my husband is really excited and super supportive so I’m having to kinda fake it to him.. inside I’m just really scared and lost and i dont know if I’m physically and emotionally okay to have a baby .. I’ve been feeling constant headaches, dizziness, im tired all the time and im starting to feel nauseous too.. i dont know if I’ll be a good mom .. i dont have any idea as to what i should do next since i just found out in pregnant.. if anyone has any tips or any words of encouragement anything helps