discouraging

We had sex two weeks ago unprotected since we're trying. Well honestly this month we just said screw it let's not think about and have fun so we've had sex everyday last month but the last time was 2 weeks ago and the past 3 days I've been nauseous and throwing up but I took 3 of the 88 cent tests since it's cheaper when trying to concieve than buying the expensive ones but they all came back negative! ): I'm 8 days late, 9 days tomorrow.. I want to give up it's been a whole year trying.