You could be pregnant but a pregnancy must first be proved or excluded with a pregnancy test. Lack of a menstrual period is the first sign of pregnancy, but is relatively insecure. This is because a missed period could also indicate other organic or functions disorders of the reproductive system. The other symptoms (sore breasts, sickness, vomiting and white discharge) are subjective signs and are not present all the time in all pregnant women. To counter speculation, you can first take a home pregnancy test.