Help!!

My
I need some health advice! I'm 23 and  ttc! I've always, my whole life had regular periods where I could always tell the exact day I was going to start. Every 23 days, lastes 4-5 days with the fifth day light spotting. I was supposed to start my cycle June 2nd, didn't start till the 7th, lasted 13 days, but never once did I bleed, it was all extremely light spotting, if you can consider it spotting. I have yet to start this month, and haven't had any spotting. I've taken multipule tests they all say negative. My breath were sore, but now are not so tender. Haven't had an appetite lately. But all tests say negative. What could cause this? Should I be worried?