Would you be mad?

If your boyfriend was out with friends but told you he was coming back to spend the night with you. It gets to 11:30 at night and he still hasn't turned up. Then when you FINALLY get in touch with him he tells you he's in another area and won't be back until morning because hes 'chilling'. He knew I was waiting up for him to get back, and I'm 30 weeks pregnant too and tired as it is. He wouldnt have even gotten in touch with me to let me know he wasnt coming if i didnt get someone to tell him to answer the phone to me. Would you be mad or am I overreacting?