Pregnancy Anxiety

I want to have kids. I really do. But I'm scared I won't be able to. For starters, I have ovarian cysts and I believe those can reduce your ability of pregnancy. Secondly, I have hereditary spherocytosis and I don't want to pass that on to my children... Finally, just knowing my luck, I won't be able to. Many of my close relatived aren't able to concieve, for they either misscarry every time or are simply unable to. I'm fairly young, so I cannot go to the doctor for a fertility test or something. I'm just scared because I know my boyfriend wants to have kids in the future but I'm scared I won't be able to give him the kids he wants and that maybe he'll leave me because of it...