I've been bleeding a week after I had my period. It's happened the past two cycles and it lasts like 2-3 days. It's light but noticeable. I don't feel extra pain or sensitivity. I'm not showing signs of pregnancy. The only thing that is different besides the extra bleeding is that I become nauseated during my period and I have lower back pain that lasts for a day. Other than that, I feel fine... I just don't know what's going on. Any advice?