I had my last normal period in September last week of September then one week then bleeding for 4 days 2nd week of October then spotting then in November started the 4 days later than should be and only 3 days with some brown spotting I am normally very regular and now they have switched up my tummy is getting round and hard I have gained 3 pounds but I am going to the bathroom regularly I took a kroger brand pregnancy test and it came out negative?