Pregnancy and fur babies

Every since I found out I've been pregnant our cat have been acting a little odd. Let me first say, he loves attention and is really spoil. Before we go anywhere we must give him enough love before we leave the door or else he will cry. Lately, he have been biting me and I am very concern about his behavior with a baby on the way. He would randomly do it and it's becoming more consistent. Every morning I wake up he is usually waiting for me outside my room door, since my husband has terrible allergies. He is not allowed in our room.  I usually spend my mornings rubbing and playing with him but it doesn't seem to be enough lately. Last night he ran up on me and bite me at least 3 times. He is starting to do it at least twice a day. I'm so nervous and worried that he will bite the baby. Help please, what can I do to stop him from randomly biting me?