Hi. Yes for the past 6 years Ive been coming to my period on the 15 of every month. Last month I came about 6 days earlier.. I had free sex with my husband about 3 times this month but because my period date changed I didn't know when I was ovulating.. On the 4th and 5th of this month I was spotting on and of during the day. My breast was sore and I had lower pain and a weird pressure in my belly button. I took a home pregnancy test yesterday but came out negative. This morning I felt very nauseous but went away... What do you think is wrong?