S.A.
Are your periods normally regular (as in one time per month) and on time? If so, the extra bleeding could be a sign of pregnancy. I had the pulling/tugging on the left side when I was first pregnant with my third. That was one of the symptoms that prompted me to take the test. I can't think of what else it could be. If it continues and your pregnancy test is negative, you should make an appt to see your GYN. Good luck!