Barely pregnant...

This may be a silly question and I'm just terrified because I had a late BFP ending in chemical last December. I am very newly pregnant after 2nd round of IVF. Before I found out I was pregnant, I had this insatiable hunger and had to eat every few hours. I attributed that as a symptom and felt it with my chemical. Well.... Several days later that feeling is gone and I barely feel anything besides excessive fatigue. My BFP is darker this morning but I don't have that nauseated/hunger. Am I freaking for nothing?  I'm scared that I'm no longer pregnant now because I'm not starving like I was last week. Any reassurance is appreciated.