Earliest you’ve gotten a positive pregnancy test??
Jan 15 was the first day of my last period 5 days after ovulation (I was tracking it) I took an hCG test and it was positive the date was February 11th. Ovulation peak strip was February 2.
If that helps 
I’m currently 15 weeks tomorrow (based on first day of last period and ultrasound!
I got mine like 2 weeks or so before my missed pwriod
I think I was like a day or two late and the line was veryyyyyy faint