17 days late.

17 days late. I've never been more then a week late. one test came up with a faint line (morning pee) clear blue said not pregnant ( afternoon pee). and i haven't taken a test since it said negative. that was almost a week ago. boobs feel very soft and squishy. had motion sickness ( i think it was) and I've never had motion sickness before. sometimes have light light cramps then it's gone. last night i stood up and i had to quickly sit back down becuase i had a sharp pain in my lower right side, I'm so confused, all the symptoms but test said negative...