The most obvious and reliable sign is a missed period. If your menstrual cycles are regular, a delay of more than a few days is the strongest indicator that you should take a test. However, if you have irregular cycles, this sign can be confusing, as a late period might just be your normal fluctuation.
Despite the name, this can happen at any time of day. It usually kicks in around week 6, but some feel "queasy" earlier. 2. The Role of Timing: When Did "It" Happen? is it possible i could be pregnant