I use the "Glow Fertility- ovulation/period tracker" app, I have been a 'member' of the Glow community for about 2 years now. I have learned that there is something called the 2WW (not to be confused with WW2)- the two week wait. So, the way I understand it is- women who are trying to conceive should wait 2 weeks after projected or confirmed ovulation to take a pregnancy test. 2 weeks. Assuming that 14 days post ovulation is time enough to see if you've gotten the deed done and if the oven's got the bun. So this month I decided to look at my "ovulation date"- which was confirmed by a very painful ovulation- and calculate the exact # of days from that day to the day my period was due to arrive. 15 days projected, it arrived in 16 days. All of the ladies who are looking for support during the 2WW say things like "When is it too early to test, I just can't wait the 14 days I want to know now". Multiply that by like, 100 people. Oooor, ...