The methods to check pregnancy are early pregnancy test strips, blood HCG, ultrasound and color ultrasound, as follows: 1. Early pregnancy test strips are the most commonly used and simplest pregnancy test method; 2. Blood HCG is the earliest pregnancy test method to know whether you are pregnant or not. If the test is too early and the gestational sac is too small, there is no way for the ultrasound to see it, and the pregnancy can be confirmed when the gestational sac can be seen under the ultrasound.