No i don't suppose that you are
pregnant. Just to be sure get an Urine
pregnancy test done from a lab. Bleeding can varry from cycle to cycle. Often depending on the situation it is scanty or profouse. Other reasons can be PCOD or Thyroiditis. Consult a gyenacologist is problem persists.
Next Steps
get UTP done from lab. also get Blood
Thyroid profile and ultrasound abdomen to rule out pregnancy and PCOD