Possibly pregnant?

I know the only way to know for sure is to take a test. I'm about 4 days away from when my period should start. I don't want to test too early and get a false negative. I just want opinions and what not. I've had flu like symptoms and my boobs hurt and my nipples are sore and always hard. And I haven't been sleeping well at night. I know there could be other explanations but I just want to know what you guys think. Maybe you've experienced these symptoms and it ended up that you were pregnant?