And, it's not "needy" to insist on being spoken to respectfully. It's powerful and strong.
Vanessa, I don't know what the circumstances were - if you were in a terrible fight, or whatever, but you need to make it clear to him he can't call you that. Period.
If he's there, I'd say very calmly, "I'm still hurting a lot from what you called me today. I'm not going to let you call me that." And then leave it. Don't listen to him argue or defend himself, just stop talking. Or text him if he's not there.
Best wishes. If you put up with that once, it will never end, and you don't deserve that from the one person in the world who should be on your side.
Wow your bf sounds like a big fat jerk. You're not being needy, if he was a real man he'd know how to treat a lady, especially his pregnant gf. You should not be afraid of telling him how you feel. He doesn't sound like he treats you very nice at all, no wonder you're needy. My goodness girl, I wish I could give you a big ol' hug.
You're not crazy, your bf needs to grow up. Have a clear calm discussion about what you need, if he is unable or unwilling to try or compromise, move on.