My period is a day late.. (which never happens) & I am super nauseous, and have had a bad headache all morning. Also last night I had cramps that were different than period cramps. It was more like a throbbing, pulling sensation. 2 days ago I took a pregnancy test & it showed negative, but I came back a few hours later & it was positive, so yesterday about 12pm I took another & it was negative? Not sure what this means. The top test is the pos from a few days ago, or evap line???? And second is from yesterday at noon...