My most fertile time was August 27th-September 1st. Had unprotected sex on August 30th. My periods are always regular and was due August 16th and 4-5 days after on September 3rd I started spotting and a couple days were a little heavy but not like my normal period, and then went back to spotting and then completely stopped. I ve had fatigue, nausea, very tender/sore breasts, light to mild cramps, and bloating along with headaches and back aches. I ve taken a pregnancy and it came back negative...my question is could I still be pregnant?