I don't want to do this to you, but keep testing yourself.
Twice since January, I had symptoms, knew it could be covid, had repeated negative tests, and when I felt better, tested positive both times.
I currently have covid, and while the couple days of scratchy throat and runny nose have cleared up, the test come up positive when it was originally negative at its worst point. The virus needs to incubate before the test detects it. That means your symptoms can pass and you can feel fine before the test is positive. Everyone is different.
Either way, drink plenty of fluids and get rest.