Catastrophising is back 😫

So I experienced some anxiety in my first trimester, and it's back with vengeance whilst I'm well into my third. It's only focused around my first born really. I have these morbid thoughts when he's sleeping, I wonder if that's what he'd look like if he were dead, I'll take photos of him and think that's the type of photo you'd have printed on a funeral order of service, he'll listen to his favourite songs and I'll think that'd be an emotional song to play at his funeral. I freak out every time someone else takes him in their car because I imagine them being in a horrific car accident. Am I going mad? Do I need to seek help for these thoughts, or are they normal during pregnancy? Help me, it's suffocating!