My girlfriend is 7 weeks pregnant and she is bugging the hell out of me when i spend a night with her?

It's her mood swings. Everything you do will be twisted into something bad in her eyes, so just sit down and have a chat with her. Understand that she's stressed out from the baby, but tell her that constantly yelling at you won't do her anything. Instead, take her out on a spa. Have a romantic dinner. Tell her she looks beautiful. Hug her, kiss her. Just make her feel good.