Implantation signs and very early pregnancy signs are considered hindsight signs. They are something that you can speculate about once you know you are pregnant but you can never be sure that they are related to implantation or pregnancy achievement.
The best signs to see on a chart when you are hoping for pregnancy are:
- a clear thermal shift,
- well-timed intercourse in the days before ovulation, and
- temperatures that remain high past your usual luteal phase length, usually for more than 15-16 days.