Before I can to this app I was on another and it told me I was supposed to start my period on the 6th never happens so took test next day and was negitive. Then I put my info on this one and it tells me I'm supposed to start today and so far I have not. I have been having sex but not for the past three days. My stomach gets wezzy sometimes and I can smell everything and certain food smells i cant take. Could I be pregnant?