My dh and I have been TTC since October of last year, and haven't had any luck yet conceiving. For the past week though, I have been cramping like I'm about to start my period, mainly in the morning and right before I go to bed. I've had some nausea right around the same time each night (don't think this is relavant, but I might as well throw it in). But that's it, no other symptoms. And my period was supposed to start some time last week. And I took a test this morning and it was negative. When should I test again?