Can you get false negative pregnancy tests on day 40 of your cycle? I have a 30 day cycle but not sure when I ovulated this month. On day 40 right now, no sign of my period. But 4 amazon cheapies have come back negative, and having constant waves of nausea which isn't usual for me. Any ideas? Is it unheard of to get a false negative at the point? DH pulls out and has done so for 9 years, so pregnancy not necessarily likely but possible.