Was the bleeding about the time you would expect your period? It may just be an off period for you this cycle.
Were you using medical assistance to become pregnant so that you know the 13th was when you ovulated? Often, focusing on just one day can cause you to miss the window of opportunity unless you know the exact day of ovulation. Even with good timing, however, pregnancy can take time.
It is best to try a pregnancy test once a period has been missed. See what happens when your period is due for March. If you start to have possible symptoms sooner, you can always try a pregnancy test sooner.
|