Pregnant?

Okay, ladies. I need some serious advice! The boyfriend & I had "protected" sex almost a week ago. I say "protected" because after he finished, we noticed the condom broke. He promises me he pulled out, but I'm not 100% positive he did or didn't.

The next day I sent him to go get Plan B, which awesome. It's 95% effective, right? Well, apparently not as effective for us big girls.

I feel like I'm experiencing some symptoms, but it could also be stress related. Some of my symptoms include a low-grade fever, acne, headache, and bloating. Sometimes I feel like I'm cramping, but I'm not sure. I say it could be stress-related because I just had surgery 2 days ago, I'm scared that I might lose my scholarship, my grades are slipping, and the two surgeries I just had are going to cost me an arm and a leg.

My next period isn't due for about a week and a half. What do you guys think? Could it be pregnancy of simply stress?