Vaccinations

I know this is a touchy subject so I don’t want anyone being rude or mean to me or others with different opinions on this post. I just need advice and want to know what you did or what you would do. My son is 3 years old. And way behind on vaccines. He got his 2 month but the doctor never scheduled the 4 month so I completely forgot about taking him. He was about 9 months when I realized he was behind. But I’ve been on the fence about catching him up. I’m so scared of him getting sick from not being vaccinated but I’m also terrified of him getting sick with the vaccines. I’ve heard SO MANY stories and so many people say they regret vaccinating. I’m absolutely terrified of vaccinating and not vaccinating. I don’t know what to do. He’s so healthy and hasn’t gotten sick since he was less than a year old. Did you regret vaccinating or not vaccinating?

ETA: his dad doesn’t want him vaccinated. And I’m indecisive. That’s why he’s 3 and not caught up.