How long to wait?

Janice
If I don't start my period today I will be 2 days late on my period. I was a few days late last month then AF decided to show. I'm afraid to go ahead and test. Don't want to waste my money and I don't feel pregnant. The only "signs" I'm having is horrible back pains in the AM and really bad acne but I've also started having cravings for Pepsi and popcicles. (I haven't drank Pepsi in 5 months) So should I go ahead and test or should I wait a few more days?