A pregnancy test cannot be taken online, since a blood or urine sample is required. Tests detect the presence of the human chorionic gonadotropin hormone in a woman's body, which indicates pregnancy, according to WebMD.
Although a woman cannot take a pregnancy test online, there are numerous online resources that give information about possible pregnancy symptoms. Some of the most common early pregnancy symptoms include increased urination, swollen or tender breasts, fatigue, food cravings or aversions, nausea, and vomiting, according to Mayo Clinic.
Women who suspect pregnancy can purchase an over-the-counter pregnancy test. Test manufacturers state these tests have up to 99 percent accuracy when taken on or after the date of a woman's missed period.