I had my tubs tied about 10 months ago. ever since then i have had a period every month lasting about 7 days with heavy flow for about 4 days then lightens up the last 3. it might be about 1-3 days late but i always get it. this month i was 6 days late and my period was sooo light i only had to change my pad at night and i the morning. i had no clots on the pad or when i went to the bathroom. the period only lated for about 4 and a 1/2 days. ever since that period which ended going on 4 days ago i have been having headaches, lower back pain and light cramping and bloating. could i be pregnant?