I have been experiencing nausea all week (vomited once), with some diahhrea, headaches, a lot of fatigue (yet I have trouble sleeping still), sensitivities to smells has increased, I gained pounds last week and dropped them in the last couple days, aversion to food even when I feel hungry it just makes me feel nauseous looking at it, when I've eaten its just come out as diahhrea after nausea, and some bloated feeling although I'm not on my cycle. I had a 2 day heavy/3 day very light cycle last week, and a normal period before that. My mate and I have sex about twice a day, but he had a vasectomy a year ago. Is there a chance I could still be pregnant? He was tested once and found to have no sperm in his specimen that he turned in...