I had sex on the 7th -15th of last month as i was ready to make a baby. On the 22nd which was just 4 days before my expected period i started experiencing bleeding accompanied by cramps which ended up as my periods anyway due to the amount of blood. This was disappointing. A week later, that was last week, i started experiencing cramps and some brownish discharge and bit of mood swing, what could this be? I carried out a pregnancy test twice which came out negative, could there still be a possibility of me being pregnant?