Driving myself crazy

I was okay until yesterday that I experienced mild nausea. I drove myself into panic that I might be pregnant from precum. I EBF & I’m only 3 months PP so I don’t have my cycle to go off by. It’s been 3 weeks 1 day since the incident & I tested this morning & it came back negative. No slight faint at all, I thought I was going to calm down but instead the “what if it’s a false negative” came to my mind. It sucks not having a cycle since idk when I’m “late” & when the test would be accurate 😕. Should I retest?