Cat becoming aggressive

So I am 16 weeks pregnant and throughout this pregnancy my cat has gone through some serious changes. In my first trimester he was super clingy and wanted to lay with me 24/7 which was ok because I was sick a lot and on the couch. Now that I am feeling better, moving around and working, he is getting aggressive when he wants attention. He has been biting both my DH and I. Does anyone have experience with this and have any ideas? I'm quite positive this is pregnancy related because he was literally a different cat before.