When should I test?

I'm super scared I'm going to get a negative if I test and I know I'll cry. It's like the worst part is having some little bit of hope and then losing all of it. I've been having symptoms: sore breasts, fatigue, and a little cramping. I'm a week away from AF but I don't usually have symptoms like this beforehand. Today I am 10DPO and I'm not sure if a test will pick it up this early? I need advice and just some calming words please