I got my BFP at 3 weeks 4 days pregnant. I hadn't even missed my period yet, I had another 4 days or so to go but this is my second baby and I just knew...so I took a test and sure enough I was right:)

1 day before my missed period

didn't have any signs of pregnancy except exhaustion so I didn't test until my next missed period. I also regularly skip periods so that wasn't a sign for me