Could I really be pregnant?

So my husband and I have recently started TTC. I've used Glow to track my fertile days. About a week after the first time, I spotted for a few hours one day. Since then, there's been no spotting, but my breasts are so sore and much heavier. Slight cramping. Food cravings. Some nausea randomly. I took a test and it came back negative. I'm thinking that maybe I tested too soon? This is all so new to me.