7dpo question

ever since like 5:15 AM today I have been feeling nauseous. I went back to sleep and woke up around 10 for the nausea to be worse. I opened the fridge to put something light in my tummy incase I had a stomach bug... and I gagged like 4 times just LOOKING at the food in the fridge. Can this be because of implantation/pregnancy? or do I have a stomach bug?