My periods were irregular so I tested 3 weeks after missed period.
i tried one week after i missed me period. I had clear lines
the day i expected my 1st period it tested positive already
5 days after a miss period to be sure
around 5 weeks, had a clear line too
1st day of missed period
about a week after missing period
5 days after i missed my period
3-4 weeks after missing period
10 days post conception