Clingy little one

My husband and I recently found out I'm about 6 weeks pregnant with our 3rd baby. My first was a miscarriage and my second I gave birth to a beautiful 5lb boy who for the first month of his life was a complete momma's boy but after that he became the world's biggest daddy's boy. He'd get upset if he saw his dad leave the room, we cosleep so he'd only want to be held by him, wanted to play with daddy etc. Basically gave me the finger the second daddy came home from work lol I didn't matter at that point but since we found out about baby number 3 my son has become incredibly clingy to me. (Please don't take this as complaining I'm not). I have to hold him all day and night. I can't even leave him alone to go pee or he cries and screams. I put him do to let him play he starts to cry. If he does let me put him in his jumper or bouncer or on his play mat he has to be touching me. He's going on 7 months old and I'm wondering if this is semi normal behavior. I know he's at the age where he starts to learn stranger danger and goes through separation anxiety but this is all new within the last week.