Bad acne on my neck- please help

At the base of my neck, right at the hairline I suddenly have TERRIBLE acne. We're not talking one or two pimples, we're talking upwards of 10 major cysts going on. 
It's painful, it's gross and it's freaking me out. Thank goodness my hair covers it almost completely.
So, two things about this.
1. HOW DO I GET RID OF THIS? Any ideas? I wash the area every night and apply benzoyl peroxide as needed, but clearly that's not cutting it anymore.
2. Could this be an early sign of pregnancy? I'd only be about 3 weeks pregnant, not even early enough to test. Did anyone else notice bad cysts on their neck in early pregnancy??
Thanks 💕