If your menstruation is usually on schedule and you are late by even one day, you might be pregnant, notes BabyCenter. However, it is rather common for women to be late in their period even if they are not pregnant. Still, it is best to check with a physician or take an over-the-counter pregnancy test to be sure.
Your doctor may require you to undergo several simple tests like urinalysis and a human chorionic gonadotropin, or hCG, blood test to find out if you are pregnant. Home pregnancy tests are designed to work just like the hCG blood test. They can detect the levels of human hCG in the body, a hormone that is only released after fertilization occurs, even if you are one day late. Levels of hCG are more easily detected in concentrated urine, so it is best to take the pregnancy test in the morning before you eat or drink anything, recommends BabyCenter.
Aside from missed period, you can also check other bodily signs that might be symptoms of a pregnancy. One symptom is elevated basal temperature, reports Baby Corner. Basal temperature usually spikes during ovulation, but during conception, it stays at elevated levels. Another is unexplained fatigue that often leads to carb cravings. Headaches, cramps and spotting are also telltale signs that you might be expecting.