You could be pregnant if you are tired and you are fatigued. But only a positive pregnancy test will provide you with the best answer. As you might already know, being tired is one of the many symptoms associated with pregnancy but it's not among the earliest signs. And by the time you are tired and fatigued you would expect to have a positive pregnancy test.
The earliest signs and symptoms of pregnancy are:
Many pregnant women are tired, but that rarely if ever happens until after you miss your period, 3-10 weeks after ovulation and fertilization.