Fear of losing newborn?

I’m a first time mom and my baby is just three days away from being 2 weeks old. Most of the time I’m able to just enjoy the little blessing I’ve been given. But throughout the day nasty thoughts creep up and leave me googling everything under the sun. Im terrified of SIDS/RSV and anything that could cause me to lose my baby. I feel like the only truly safe place is in my arms. Im starting to have breakdowns here and there wondering if im doing things right and if I’ll lose him. Is this normal or is it early signs of PPD? Im starting to drive my partner a little nuts with my paranoia. But after suffering two pregnancy losses and carrying him for 9mo safe in my belly, I just can’t help but be afraid. I tell myself he’s safe and everything is ok and he’s healthy. But the fear is still there. Tips?