I had my period Aug. 2-6, it's normal for me to only have a five days period. Me and my boyfriend had protected, with a condom, sex on Aug. 10th. I'm not on birth control, and I assume he put it on right, but I'm now 5 days late on my period, I should've started on the Spet. 3rd. I'm not sure if i'm pregnant, or if it's just stress related. I've been eating alot more, but that can be stress related too. I'm having cramps and constipation. I'm getting headaches, and I'm tired alot. Please, is it stress, or could I be pregnant??