11 weeks pregnant how can i tell if i have stomach flu or if it's the pregnancy?

Versus: The symptoms of stomach flu (viral gastroenteritis) can include: nausea, vomiting, headache, watery bowel movements (not bloody), abdominal cramps and a low fever. In early pregnancy you may experience tender or swollen breasts, nausea or vomiting; lack of a period; increased frequency of urination; headaches, insomnia, fatigue. Moodiness, mild cramping, food cravings; passing gas; enlarging waist.