I ovulated around July 4-5 (last sex was the night of July 3). Since then (literally) I've been nauseous. Over the past 2 days, my breasts have become increasingly sensitive (but not sore or achy, and my nipples haven't changed color), and I've been experiencing mild cramping. Because of the horrendous nausea, I took a pregnancy test Monday (7/7) (which I know is too early) but I did see a very faint line, and then again the same faint line on Tuesday. Ever since then, I've taken 2 more tests and they've been negative. I know I shouldn't be getting my period until the 18th or so, but I'm just confused. Please advise!