Glow says my fertile window began the 7th and ended the 13th. We had sex on the 6th, 8th, 9th, and 13th. I've been feeling nauseous, having hot flashes, some cramping, tired all the time, back aches, headaches, peeing more than usual and hungry and then not eating. For example I had some chicken fried rice, orange juice, and Reese's stick for lunch yesterday and hardly ate because I just felt nauseous. I took a test this morning after I woke up and got a negative. I know it's too early to test but I'm impatient! My next expected period is in 12 days. Is this all in my head? When would be a good time to test next?