After a few seconds or 1-2 minutes approximately, a second band appears therefore please be patient, if not immediately what can be seen, it may take a few minutes, when the hormone in the body is also increased because, otherwise you see, of course, no second strip (of course not wait too long, otherwise it is sometime away again). The second strip is getting stronger, the ES is closer before. Well, this also on the NFP (Natural Family Planning) using the mucus method (cervical mucus) a second means to control to have. Since after the darkest second strip of IT in the next 12 -. Can be triggered 36 hours, it is good earlier 1-2 days together to Herzlen because the sperm for about 12 hours until they need when. Once EZ u. Sperm can survive well yes about 2-3 days. - There are the strip for different sensitivity measurements, possibly even in a different thickness change if it appears not good or if it is only displayed.. I think they are as good as the expensive Clearblue from the pharmacy, have thus checked the value. Fct. Super. However, it is considered the first strong indication to the second strip, even if it is still as long as 2 days or displayed because of it can get instead found. Tip, sometimes with expensive from the pharmacy (there also at Amazon) to measure if is clearly displayed in the Aide second strip. Attention, depending on cycle not even take place on the instructions, when a normally when calculating the average cycle is to find exit, it can take as early as 7 or 8 day despite longer cycles or if it is irregular, therefore is the observation of cervical mucus can be helpful for more precise determination or even consider using ultrasound to the gynecologist, as it is with the ES.