Confused

Erica
My last period started a week early spotting day 1 + 2, day 3 light flo day 4 nothing day 5 spotting for less then 5 minutes. 2 days after the bleeding stops I began to have random nausea to the point of vomiting. Now I have to urinate every hour or 2. Has this ever happened to anyone? I just assumed my cycle changed. Any suggestions or ideas would be great.