I'm losing it guys 😭

I'm 30 weeks today. Just six weeks ago one of my best friends had her daughter 4 weeks early. Perfectly healthy and happy. They firgured they must have gotten her due date wrong. This morning my jaw dropped and my heart shattered. Her daughter died of SIDs over night. Our kids were supposed to grow up together. I feel such guilt and I'm so afraid of having my son now. He's due in 10 short weeks. I don't understand how this could happen, there was nothing wrong with that precious baby last night. What could have went wrong, how do I keep it from happening to my son. Is there even anything I can do to lessen the risk of SIDS?????