Early Symptoms???

Whitney • 27.Married.Miscarried 4 times. Now Pregnant
So I ovulated 12/23. We had sex 4 times in my fertile window. I had mild lower abdominal cramps 12/29 &12/30. And for the past 2 days anything I eat makes me nauseated. Nothing taste or smells right. Could this be early symptoms or many a stomach bug? If I am pregnant I would only be 3 weeks. Can you get symtoms this early??