Weird period....

Emma
Hi ladies, I got my period on the 09/16  and was in agony for 4 hours with stomach cramps. I thought it would be a horrific period but turned out to be hardly any bleeding! I normally bleed for 7 days with the first 3 days very heavy but this time I did not even fill a tampon and did not have to use one for days 4&5, day 6&7 was just spotting. I've been feeling nausea for the last week and stomach slightly swollen. Have taken a HPT but negative. Anyone else had similar and was pregnant?