Question

Not sure if this happens to anyone else. I am due for my period tomorrow. I have taken a few pregnancy tests within the last week and all have said negative. Also within the last week or so I will eat something and every once in awhile I have to stop and put it down because I get a little nauseous. It passes shortly. Today I have extremely short spells of nausea, when I say short I mean it comes and goes in seconds. No other symptoms though. Any thoughts or this happen to anyone else?