I am 5weeks and 3 days preganant . I kept tracking my bhcg levels using upt kits . I got a faint postive line even before my missed periods . Precisely on 9th day after ovulation I got a faint postive line , it got darker everyday and I got a line as same as control line after 17days post ovulation that was 1 day after my missed period .
It varries from individual to individual .There are many upt kits available which can detect bhcg levels 6-7 days before missed period.