A little help!?

Samantha
So I was due for af on Tuesday and didn't get it till weds, the past two days I have felt nauseas and kinda sensative to food. We took a test on Monday and it was negative, usually I have to change my tampon ever 2 hours because it's really heavy, but I've actually been able to change it at a longer time. Could I be pregnant, or just have wishful thinking?