Covid vaccine

I had a family member tell me that the covid vaccine causes infertility and miscarriages. I know that can’t be true because they just came out with the shot so how can they know that quickly? She said her friend had a miscarriage and she has other kids so it had to be because of the shot which makes no sense because people have miscarriages all the time even if they have had other kids. Someone tell me she’s wrong because I want more kids but I also want to get vaccinated and I’m breastfeeding as well. Someone ease my mind and tell me she’s crazy lol