confused

So here is a little bit of my back history.

I am 31 years old and married. My husband and I have been trying to get pregnant for the past year. Well I will go months with out even having AF. last time I had AF was in the beginning of January. I should have had AF a few weeks ago. AF did not show up. I took a test and it was negative. I don't even recall ovulating last month either. Well now it seems only a few certain foods I eat keep making me sick to my stomach. I love sushi and have been craving it so we went out to dinner the other day and he got me sushi. I ate about 2 pieces then felt really nauseous. Well I shook it off like it was nothing until just now I made my husband and myself some egg and onion burritos and they did the same thing. Is it possible I could be pregnant and might have missed testing when I was ovulating or might I just be over reacting.