Lateness

Well I've been tracking my cycle and ovulation for awhile now my periods haven't usually been off the set date more than a day or two. My original period start date was supposed to be the 9th this month. I took a first signal pregnancy test at a week late but it was negative. Still no period tho and I just don't feel right more upbeat and perky than my usual and no depressed touchy pissyness like I normaly feel before a period. Plus been getting randomly Sick feeling specialy at certain food smells. Could the test be wrong