Could it be? Please help.

My period is usually 4 days long and i don't know if it was my period now because when I ovulate I usually have ovulation pain and I didn't have any this fertile week, back to the period it was light the first day normal the second and spotting the 3rd and 4th day. I took a pregnancy test after my period and it was negative but could I still be. I also usually get lots of ewcm and this fertile week I almost had none.