Confused

Can someone please answer for me? My husband and I have been TTC for over a year now. Today was the day I was suppose to get my period. But I started yesterday. My cycles are normally on the heavier side. Nothing to major. I cramped really bad for a few days last week. And now, the bleeding is so light I could probably use a panty liner. I feel sick, I'm so tired, my back is aching. And my boobs are kind of sore...... Can someone please tell me what all this is?????