I am sexually active with my partner for 4 years. No protection used. This month I have been moody, backache, cramps, dizziness, short of breath when walking up stairs, insomnia, really vivid dreams and this all started when I should have gotten my period on the 27th. The dreams, and insomnia with headaches started about a week ago. Today would have been my 4th day late for my period but I finally got it in the middle of the day. I am still cramping and the bleeding is light but dark which is not usual. What do you think this could be? I took a pregnancy test 3 days ago and it was negative. Should I wait a few more days and take another one?