For the past 4 days, I've been feeling nauseous some point throughout the day. However, whenever I would sleep and wake up, the feeling would be gone. Then yesterday, I had diarrhea. I had constipation (and it's a regular thing or me because I have Hypothyroidism) for about 2 weeks. Last time I had protected sex was on October 20. I've been feeling fine since until last Wednesday. Am I pregnant or is this like a stomach flu?