Frustrated!

I've been trying for 6 yrs to get pregnant. I've had 3 miscarriages, and I can't afford fertility treatments. These last 6 months, my cycle has been like clockwork. I was supposed to start my period today (still a no show!) I have been extremely nauseous for week, killer migraines, and a feeling of fullness. I've also been real gassy and so tired. I took a pregnancy test a bit ago, and it's negative. I'm worried and nervous! Am I completely out this month?