Very helpful and accurate - has helped me get pregnant twice now! Sadly I miscarried the first baby and so used this app again when we started trying again a couple of months later. However, I think it should automatically update your cycle info when you report a positive pregnancy test and not keep asking if a period has started. I also think it would be useful to allow you to report other issues such as miscarriage bleeding etc, or at least give better instructions for how to do this. I added this as a period but that obviously messed up the other data i had previously added, as it was counting a really long cycle instead. This may be the only way to do it but just an idea for improvements.