My dog went from sweet to grumpy?

So, bf and I live with my parents. I’ve had my dog since he was 8 weeks old. He grew up at my parents. Well, now he’s about 2 and a half years old.

Just recently about two months ago till now he has been growling and snapping. He has his own doggy area in the living room.

When my mom and or dad get close to me, he growls at them.

Today my dog bit my moms boob and lunged at my day when he came home from work. Not playfully, but wanting to bite him.

Every time one of use walks through the door, he starts growling and barking until he sees us in sight.

When I go to the bathroom in the middle of the night, he growls. He stops growling when I let him know it’s me.

He basically has taken this aggression towards my parents. Thing is, my parents don’t do anything to him. They aren’t mean to him. He grew up with my parents. He just started doing this two months ago.

He hears a noise at night, he starts growling.

Well, only thing that has changed in the household has been that I’m pregnant.

My dog is a labrador retriever. I’ve had two labs in the past, never experienced anything like this.

What could this be? Anyone ever experience this before? If so, how did you address it? It’s been twice that my dog has bit my mom. It hurts me to know that who I love hurt my mom. I love them both.