Hi, Thanks for the query. Just by symptoms we cannot come to one conclusion regarding pregnancy. Vomitings and diarrhea can be seen due to gastroenteritis also. So, better to go for confirmative test. Once go for urine test for pregnancy. If the test comes negative, the possibility of pregnancy is less. You consult gynecologist once and go for ultrasound. Ultrasound helps in ruling out the possibility of pregnancy and also helps in finding out the possible cause for your delayed periods. With your doctor s advice once check for blood sugar levels, thyroid profile. By examination and investigations the possible cause for your problem can be identified and treated. Take care.